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Gastrointestinal and Nutrition Physiology

Liver and Pancreas Functions Practice Questions

60 free Liver and Pancreas Functions practice questions for the Physiology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.

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Question 1 of 60 Medium

Which liver function is essential for digestion and absorption of fats?

  1. A Storage of glycogen
  2. B Secretion of bile
  3. C Detoxifying drugs
  4. D Making proteins

Correct answer: Secretion of bile

Bile secreted by the liver emulsifies dietary fats. This process increases the surface area for lipase action and fat absorption.

Question 2 of 60 Medium

Which pancreatic secretion is primarily responsible for neutralizing gastric acid in the duodenum?

  1. A Trypsinogen
  2. B Amylase
  3. C Bicarbonate
  4. D Lipase

Correct answer: Bicarbonate

Pancreatic bicarbonate neutralizes acidic chyme entering the duodenum. This creates an optimal pH for digestive enzymes.

Question 3 of 60 Medium

Which liver cell type is responsible for bile production?

  1. A Kupffer cells
  2. B Hepatocytes
  3. C Endothelial cells
  4. D Stellate cells

Correct answer: Hepatocytes

Hepatocytes synthesize and secrete bile. Bile components are essential for fat digestion and waste excretion.

Question 4 of 60 Medium

Which pancreatic enzyme digests proteins into peptides?

  1. A Amylase
  2. B Lipase
  3. C Trypsin
  4. D Nuclease

Correct answer: Trypsin

Trypsin is a proteolytic enzyme secreted by the pancreas. It breaks proteins into smaller peptides in the small intestine.

Question 5 of 60 Medium

Which substance is synthesized exclusively by the liver?

  1. A Albumin
  2. B Insulin
  3. C Glucagon
  4. D Secretin

Correct answer: Albumin

Albumin is synthesized only by hepatocytes. It plays a crucial role in maintaining plasma oncotic pressure.

Question 6 of 60 Medium

Which pancreatic hormone lowers blood glucose levels?

  1. A Glucagon
  2. B Insulin
  3. C Somatostatin
  4. D Pancreatic polypeptide

Correct answer: Insulin

Insulin facilitates cellular uptake of glucose and promotes glycogen synthesis. This lowers blood glucose concentration.

Question 7 of 60 Medium

Which liver function converts ammonia into a less toxic compound?

  1. A Gluconeogenesis
  2. B Urea synthesis
  3. C Bile secretion
  4. D Cholesterol synthesis

Correct answer: Urea synthesis

The liver converts toxic ammonia into urea via the urea cycle. Urea is then excreted by the kidneys.

Question 8 of 60 Medium

Which pancreatic enzyme is most important for fat digestion?

  1. A Trypsin
  2. B Amylase
  3. C Lipase
  4. D Elastase

Correct answer: Lipase

Pancreatic lipase hydrolyzes triglycerides into fatty acids and monoglycerides. It is essential for fat digestion.

Question 9 of 60 Medium

Which liver function is directly involved in blood clotting?

  1. A Excretion of bilirubin waste
  2. B Synthesis of clotting factors
  3. C Detoxification of drugs
  4. D Storage of fat-soluble vitamins

Correct answer: Synthesis of clotting factors

The liver synthesizes several clotting factors including fibrinogen and prothrombin. These are essential for normal coagulation.

Question 10 of 60 Medium

Which pancreatic secretion digests carbohydrates?

  1. A Trypsin
  2. B Lipase
  3. C Amylase
  4. D Carboxypeptidase

Correct answer: Amylase

Pancreatic amylase breaks down starch into simpler sugars. It initiates carbohydrate digestion in the small intestine.

Question 11 of 60 Medium

Which liver cell acts as a macrophage within hepatic sinusoids?

  1. A Hepatocyte
  2. B Kupffer cell
  3. C Stellate cell
  4. D Cholangiocyte

Correct answer: Kupffer cell

Kupffer cells are specialized macrophages lining hepatic sinusoids. They remove bacteria and debris from portal blood.

Question 12 of 60 Medium

Which pancreatic hormone raises blood glucose levels during fasting?

  1. A Insulin
  2. B Somatostatin
  3. C Glucagon
  4. D Pancreatic polypeptide

Correct answer: Glucagon

Glucagon increases blood glucose by stimulating glycogenolysis and gluconeogenesis. It is secreted during fasting.

Question 13 of 60 Medium

Which liver process is responsible for converting vitamin D into its active form?

  1. A Hydroxylation
  2. B Conjugation
  3. C Deamination
  4. D Oxidation

Correct answer: Hydroxylation

The liver performs the first hydroxylation step of vitamin D metabolism. This is necessary for its eventual activation.

Question 14 of 60 Medium

Which pancreatic enzyme is secreted as an inactive precursor?

  1. A Amylase
  2. B Lipase
  3. C Trypsinogen
  4. D Nuclease

Correct answer: Trypsinogen

Trypsinogen is secreted in an inactive form to prevent autodigestion. It is activated to trypsin in the duodenum.

Question 15 of 60 Medium

Which liver function helps maintain normal blood glucose between meals?

  1. A Glycogenesis
  2. B Glycogenolysis
  3. C Lipogenesis
  4. D Protein synthesis

Correct answer: Glycogenolysis

Glycogenolysis involves breakdown of stored glycogen to glucose. This helps maintain blood glucose during fasting.

Question 16 of 60 Medium

Which pancreatic cells secrete digestive enzymes?

  1. A Alpha cells
  2. B Beta cells
  3. C Acinar cells
  4. D Delta cells

Correct answer: Acinar cells

Acinar cells form the exocrine pancreas. They secrete digestive enzymes into the pancreatic ducts.

Question 17 of 60 Medium

Which liver function is most important for drug metabolism?

  1. A Phase I and II reactions
  2. B Bile salt synthesis
  3. C Vitamin storage
  4. D Plasma protein synthesis

Correct answer: Phase I and II reactions

The liver metabolizes drugs through Phase I and Phase II reactions. This enhances drug solubility for excretion.

Question 18 of 60 Medium

Which pancreatic secretion protects the intestine from autodigestion?

  1. A Bicarbonate
  2. B Trypsin
  3. C Amylase
  4. D Lipase

Correct answer: Bicarbonate

Bicarbonate neutralizes gastric acid in the duodenum. This prevents damage to intestinal mucosa and optimizes enzyme activity.

Question 19 of 60 Medium

Which liver function contributes to immune defense?

  1. A Albumin synthesis
  2. B Kupffer cell activity
  3. C Bile production
  4. D Cholesterol metabolism

Correct answer: Kupffer cell activity

Kupffer cells phagocytose pathogens from portal blood. This provides an important immune defense mechanism.

Question 20 of 60 Medium

Which pancreatic enzyme digests nucleic acids?

  1. A Protease
  2. B Amylase
  3. C Lipase
  4. D Nuclease

Correct answer: Nuclease

Pancreatic nucleases break down DNA and RNA into nucleotides. This facilitates absorption of nucleic acid components.

Question 21 of 60 Medium

Which enzyme in the liver is responsible for the conjugation of bilirubin with glucuronic acid to make it water-soluble?

  1. A Heme oxygenase enzyme complex
  2. B UDP-glucuronosyltransferase
  3. C Biliverdin reductase enzyme
  4. D Cytochrome P450 monooxygenase

Correct answer: UDP-glucuronosyltransferase

UGT converts unconjugated bilirubin into conjugated bilirubin by adding glucuronic acid molecules. This process is essential for making bilirubin water-soluble so it can be excreted into the bile.

Question 22 of 60 Medium

The secretion of bicarbonate-rich fluid from pancreatic ductal cells is primarily stimulated by which hormone released from the duodenum?

  1. A Cholecystokinin (CCK)
  2. B Gastrin
  3. C Secretin
  4. D Motilin

Correct answer: Secretin

Secretin is released by S-cells in the duodenum in response to acidic chyme. It acts on pancreatic ductal cells to increase the production of bicarbonate, which neutralizes gastric acid.

Question 23 of 60 Medium

A patient with severe liver failure often exhibits bruising and prolonged bleeding. This is primarily due to the liver's inability to synthesize which of the following?

  1. A Vitamin K from the diet
  2. B Clotting factors like prothrombin
  3. C Platelets in the bone marrow
  4. D Tissue plasminogen activator (tPA)

Correct answer: Clotting factors like prothrombin

The liver synthesizes nearly all essential coagulation factors, including factors I (fibrinogen), II (prothrombin), VII, IX, and X. Deficiency in these proteins leads to impaired clot formation and increased bleeding risk.

Question 24 of 60 Medium

Which enzyme, located on the brush border of the small intestine, is the essential 'trigger' for activating the pancreatic proteolytic cascade?

  1. A Trypsin from the pancreas
  2. B Chymotrypsin from acinar cells
  3. C Enteropeptidase (enterokinase)
  4. D Carboxypeptidase A

Correct answer: Enteropeptidase (enterokinase)

Enteropeptidase converts inactive trypsinogen into active trypsin. Once trypsin is formed, it autocatalytically activates more trypsinogen and other proenzymes like chymotrypsinogen and procarboxypeptidase.

Question 25 of 60 Medium

The 'Enterohepatic Circulation' refers to the process by which the liver efficiently recycles which substance?

  1. A Bilirubin
  2. B Bile salts
  3. C Pancreatic amylase
  4. D Insulin

Correct answer: Bile salts

Approximately 95% of bile salts are reabsorbed in the terminal ileum and returned to the liver via the portal vein. This recycling mechanism allows the liver to reuse the bile salt pool multiple times during a single meal.

Question 26 of 60 Medium

During prolonged fasting, the liver maintains blood glucose levels through gluconeogenesis. Which of the following is a primary substrate used by the liver for this process?

  1. A Glycogen from the liver
  2. B Acetyl-CoA from beta-oxidation
  3. C Amino acids such as alanine
  4. D Fatty acids from adipose tissue

Correct answer: Amino acids such as alanine

Gluconeogenesis is the synthesis of glucose from non-carbohydrate sources like lactate, glycerol, and glucogenic amino acids. While glycogen provides glucose via glycogenolysis, it is not a substrate for gluconeogenesis itself.

Question 27 of 60 Medium

In pancreatic ductal cells, the apical transport of bicarbonate into the lumen is most closely linked to the exchange of which ion?

  1. A Sodium (Na+)
  2. B Chloride (Cl-)
  3. C Potassium (K+)
  4. D Hydrogen (H+)

Correct answer: Chloride (Cl-)

Bicarbonate is secreted into the pancreatic duct lumen via a Cl-/HCO3- exchanger. The recycle of chloride through the CFTR channel is necessary to maintain the gradient required for continued bicarbonate secretion.

Question 28 of 60 Medium

The liver prevents systemic toxicity by converting ammonia, a byproduct of protein metabolism, into which less toxic substance?

  1. A Uric acid
  2. B Creatinine
  3. C Urea
  4. D Glutamine

Correct answer: Urea

The urea cycle takes place in hepatocytes to convert highly toxic ammonia into urea. Urea is then released into the blood and subsequently excreted by the kidneys.

Question 29 of 60 Medium

Cholecystokinin (CCK) primarily stimulates the 'exocrine' pancreas to release which of the following?

  1. A Bicarbonate ions from ductal cells
  2. B Digestive enzymes from acinar cells
  3. C Glucagon from pancreatic alpha cells
  4. D Bile secreted into the hepatic duct

Correct answer: Digestive enzymes from acinar cells

CCK is secreted by the duodenum in response to fats and proteins. It acts on pancreatic acinar cells to trigger the exocytosis of digestive enzymes like lipase, amylase, and proteases.

Question 30 of 60 Medium

Which specialized liver cells are part of the reticuloendothelial system and function to clear bacteria and aged red blood cells from the portal blood?

  1. A Hepatocytes
  2. B Hepatic Stellate cells (Ito cells)
  3. C Kupffer cells
  4. D Cholangiocytes

Correct answer: Kupffer cells

Kupffer cells are resident macrophages located within the hepatic sinusoids. They serve as a critical filter for the blood coming from the gastrointestinal tract, removing pathogens and debris.

Question 31 of 60 Medium

The 'First-Pass Effect' describes the liver's ability to:

  1. A Synthesize bile before food reaches the stomach
  2. B Metabolize absorbed drugs before they reach circulation
  3. C Excrete digestive enzymes into the duodenum during a meal
  4. D Filter arterial blood before it enters the portal circulation

Correct answer: Metabolize absorbed drugs before they reach circulation

Nutrients and orally administered drugs absorbed in the small intestine travel via the portal vein directly to the liver. The liver may extensively metabolize these substances during this 'first pass,' significantly reducing their systemic bioavailability.

Question 32 of 60 Medium

Pancreatic lipase requires which helper protein to successfully bind to and digest lipid droplets coated with bile salts?

  1. A Enterokinase
  2. B Colipase
  3. C Pepsin
  4. D Lecithin

Correct answer: Colipase

Bile salts can actually displace lipase from the surface of fat droplets. Colipase is secreted by the pancreas and binds to both the bile salts and the lipase, anchoring the enzyme to the fat droplet so digestion can occur.

Question 33 of 60 Medium

The liver is the sole producer of albumin. What is the primary physiological consequence of significantly low serum albumin levels?

  1. A Increased blood viscosity and clotting
  2. B Loss of oncotic pressure causing edema
  3. C Reduced oxygen transport in the blood
  4. D Inability to form a stable platelet plug

Correct answer: Loss of oncotic pressure causing edema

Albumin is the major contributor to plasma colloid osmotic (oncotic) pressure. When liver disease reduces albumin production, water shifts from the intravascular space into the interstitial tissues, resulting in ascites and peripheral edema.

Question 34 of 60 Medium

To prevent 'autodigestion' of the pancreas, proteolytic enzymes are stored in zymogen granules along with which protective substance?

  1. A Trypsin inhibitor
  2. B Bicarbonate
  3. C Hydrochloric acid
  4. D Enteropeptidase

Correct answer: Trypsin inhibitor

The pancreas secretes Pancreatic Secretory Trypsin Inhibitor (PSTI) to neutralize any small amounts of trypsin that might be prematurely activated within the pancreatic ducts, protecting the organ from inflammation.

Question 35 of 60 Medium

Hepatic Stellate cells (Ito cells), located in the Space of Disse, are physiologically unique for their ability to store:

  1. A Glycogen
  2. B Iron
  3. C Vitamin A
  4. D Vitamin B12

Correct answer: Vitamin A

In a healthy liver, Stellate cells are the primary storage site for Vitamin A (retinoids). However, following chronic liver injury, these cells transform into myofibroblasts and are responsible for producing the collagen that leads to cirrhosis.

Question 36 of 60 Medium

Why is the neutralization of chyme by pancreatic bicarbonate essential for fat digestion?

  1. A Acid activates bile salts
  2. B Pancreatic lipase is inactivated at low pH
  3. C Gastric lipase requires a pH of 8 to function
  4. D Bicarbonate breaks down triglycerides directly

Correct answer: Pancreatic lipase is inactivated at low pH

Pancreatic lipase and other enzymes have an optimal pH range that is neutral to slightly alkaline. Without bicarbonate to neutralize the acidic chyme from the stomach, these enzymes would be denatured and fat absorption would fail.

Question 37 of 60 Medium

While the liver produces bile continuously, the gallbladder's primary physiological role is to:

  1. A Synthesize secondary bile acids
  2. B Filter excess cholesterol from stored bile
  3. C Concentrate bile by reabsorbing water and salts
  4. D Activate pancreatic amylase before it reaches the gut

Correct answer: Concentrate bile by reabsorbing water and salts

The gallbladder stores bile and increases its potency by reabsorbing sodium and water. This concentrates the bile salts and organic constituents, allowing a small volume of stored bile to handle a large amount of dietary fat.

Question 38 of 60 Medium

Within the Islets of Langerhans, which cells are responsible for secreting Somatostatin, and what is its effect on the pancreas?

  1. A Alpha cells that raise glucagon release rates
  2. B Beta cells that raise insulin secretion rates
  3. C Delta cells that inhibit insulin and glucagon
  4. D PP cells that stimulate exocrine pancreatic secretion

Correct answer: Delta cells that inhibit insulin and glucagon

Delta cells secrete somatostatin, which acts as a paracrine inhibitor. It locally suppresses the secretion of both insulin and glucagon, as well as inhibiting pancreatic exocrine function.

Question 39 of 60 Medium

Phase I of hepatic drug metabolism typically involves which of the following chemical modifications?

  1. A Conjugation of the drug with glutathione
  2. B Oxidation or reduction via cytochrome P450
  3. C Attachment of a glucuronide group to the drug
  4. D Sulfation of the drug molecule for excretion

Correct answer: Oxidation or reduction via cytochrome P450

Phase I reactions (functionalization) usually involve the Cytochrome P450 system to add or expose a polar group. Phase II reactions involve conjugation, where a large polar molecule is attached to make the drug ready for excretion.

Question 40 of 60 Medium

Which of the following describes the liver's 'glucose buffer' function?

  1. A The liver absorbs all of the dietary glucose and never releases it back
  2. B The liver stores glucose after meals and releases it when levels fall
  3. C The liver converts excess glucose into urea to maintain osmolarity
  4. D The liver secretes its own insulin to lower blood glucose directly

Correct answer: The liver stores glucose after meals and releases it when levels fall

By performing glycogenesis (storage) when glucose is high and glycogenolysis (release) when glucose is low, the liver acts as a buffer to maintain blood glucose levels within a narrow physiological range, vital for brain function.

Question 41 of 60 Medium

Which of the following describes the 'Classical Hepatic Lobule' model of liver architecture?

  1. A A unit centered on the portal triad draining toward a central vein
  2. B A unit centered on the central vein draining toward a portal triad
  3. C A diamond-shaped unit based on blood supply from the hepatic artery
  4. D A unit defined primarily by the flow of bile toward the gallbladder

Correct answer: A unit centered on the portal triad draining toward a central vein

The classical lobule is a hexagonal structure with a central vein at its center and portal triads at the corners; blood flows from the periphery to the center.

Question 42 of 60 Medium

The primary stimulus for the secretion of enzyme-rich pancreatic juice from acinar cells is:

  1. A Secretin
  2. B Gastrin
  3. C Cholecystokinin
  4. D Vasoactive Intestinal Peptide

Correct answer: Cholecystokinin

CCK is released by I-cells in the duodenum in response to fats and proteins; it acts on acinar cells to trigger the release of digestive enzymes.

Question 43 of 60 Medium

Which enzyme is responsible for the 'Phase II' conjugation of lipid-soluble substances in the liver to make them water-soluble?

  1. A Cytochrome P450 monooxygenase
  2. B UDP-glucuronosyltransferase
  3. C Alcohol dehydrogenase
  4. D Alanine aminotransferase

Correct answer: UDP-glucuronosyltransferase

Phase II metabolism involves conjugation reactions, such as glucuronidation, which add polar groups to molecules to facilitate renal or biliary excretion.

Question 44 of 60 Medium

In the pancreatic ductal cell, bicarbonate is secreted into the lumen primarily via which transporter?

  1. A Sodium-glucose cotransporter
  2. B Na+/K+ ATPase
  3. C H+/K+ ATPase
  4. D Cl-/HCO3- exchanger

Correct answer: Cl-/HCO3- exchanger

Pancreatic ductal cells use a chloride-bicarbonate exchanger on the apical membrane to secrete HCO3- into the ductal lumen.

Question 45 of 60 Medium

What is the physiological significance of the 'Space of Disse' in the liver?

  1. A It is the site of bile acid conjugation.
  2. B It acts as a storage reservoir for bile.
  3. C It contains the nerves that control hepatic blood flow.
  4. D It permits exchange between sinusoids and hepatocytes.

Correct answer: It permits exchange between sinusoids and hepatocytes.

The Space of Disse is the narrow gap between the sinusoidal endothelium and hepatocytes, allowing plasma to bathe the microvilli of the hepatocytes for efficient nutrient and drug uptake.

Question 46 of 60 Medium

Which pancreatic enzyme is secreted in its active form, unlike the proteases?

  1. A Trypsinogen
  2. B Chymotrypsinogen
  3. C Pancreatic Amylase
  4. D Procarboxypeptidase

Correct answer: Pancreatic Amylase

Pancreatic amylase and lipase are secreted in their active forms, whereas proteolytic enzymes must be secreted as zymogens to prevent pancreatic damage.

Question 47 of 60 Medium

A patient with cirrhosis has a significantly reduced ability to convert ammonia to urea. This process occurs via which biochemical pathway?

  1. A Cori cycle
  2. B Krebs cycle
  3. C Urea cycle
  4. D Pentose phosphate pathway

Correct answer: Urea cycle

The liver clears toxic ammonia produced by gut bacteria and protein metabolism by converting it into water-soluble urea via the Urea cycle.

Question 48 of 60 Medium

Bile salts are essential for lipid digestion because they:

  1. A Chemically break the ester bonds of triglycerides.
  2. B Transport long-chain fatty acids directly into the portal vein.
  3. C Inhibit the action of gastric pepsin.
  4. D Decrease the surface tension of fat droplets.

Correct answer: Decrease the surface tension of fat droplets.

Bile salts are amphipathic, allowing them to emulsify large fat globules into smaller micelles, increasing the surface area for lipase to act upon.

Question 49 of 60 Medium

The 'Hepatic Acinus' model (Rappaport) is clinically useful because it categorizes hepatocytes based on:

  1. A Their oxygen and nutrient gradient.
  2. B Their proximity to the bile duct.
  3. C Their ability to divide during regeneration.
  4. D The amount of glycogen they store.

Correct answer: Their oxygen and nutrient gradient.

The acinus model describes three zones: Zone 1 (periportal) is well-oxygenated, while Zone 3 (centrilobular) is most susceptible to hypoxia and toxins.

Question 50 of 60 Medium

Which hormone inhibits both exocrine and endocrine pancreatic secretions?

  1. A Secretin
  2. B Glucagon
  3. C Vasoactive Intestinal Peptide (VIP)
  4. D Somatostatin

Correct answer: Somatostatin

Somatostatin, released by D-cells, acts as a potent inhibitor of almost all gastrointestinal and pancreatic secretions.

Question 51 of 60 Medium

Which of the following is a primary bile acid synthesized from cholesterol by the liver?

  1. A Deoxycholic acid
  2. B Lithocholic acid
  3. C Ursodeoxycholic acid
  4. D Cholic acid

Correct answer: Cholic acid

Cholic acid and chenodeoxycholic acid are 'primary' bile acids synthesized by the liver. Deoxycholic and lithocholic are 'secondary' acids formed by gut bacteria.

Question 52 of 60 Medium

The 'Potentiating Effect' in the pancreas refers to the observation that:

  1. A Secretin and CCK act synergistically together.
  2. B Vagal stimulation stops all hormonal action.
  3. C Bicarbonate inhibits the action of lipase.
  4. D Glucagon stimulates the release of digestive enzymes.

Correct answer: Secretin and CCK act synergistically together.

Secretin and CCK act via different second messenger pathways (cAMP and Ca2+), leading to a synergistic or potentiated effect on pancreatic secretion.

Question 53 of 60 Medium

Which plasma protein, synthesized by the liver, is the primary carrier for iron in the blood?

  1. A Transferrin
  2. B Albumin
  3. C Ceruloplasmin
  4. D Haptoglobin

Correct answer: Transferrin

Transferrin is a beta-globulin produced by the liver that transports iron throughout the body; ceruloplasmin transports copper.

Question 54 of 60 Medium

In the liver, 'First-Pass Metabolism' refers to the degradation of a drug absorbed from the:

  1. A Systemic circulation
  2. B Hepatic artery
  3. C Lymphatic system
  4. D Hepatic portal vein

Correct answer: Hepatic portal vein

Drugs absorbed from the GI tract travel via the portal vein directly to the liver, where they may be significantly metabolized before reaching the heart and systemic circulation.

Question 55 of 60 Medium

Which ion is actively transported out of the gallbladder to facilitate the concentration of bile?

  1. A Na+
  2. B K+
  3. C Ca2+
  4. D Mg2+

Correct answer: Na+

The gallbladder concentrates bile by actively reabsorbing Sodium (Na+), with water following osmotically, increasing the concentration of bile salts up to 20-fold.

Question 56 of 60 Medium

Which component of the pancreatic juice is essential for the activation of all other proteolytic zymogens?

  1. A Trypsin
  2. B Chymotrypsin
  3. C Pepsin
  4. D Elastase

Correct answer: Trypsin

Once trypsinogen is converted to trypsin by enteropeptidase, trypsin itself goes on to activate chymotrypsinogen, procarboxypeptidase, and more trypsinogen.

Question 57 of 60 Medium

Jaundice (icterus) occurs when there is an accumulation of which substance in the tissues?

  1. A Cholesterol
  2. B Bile salts
  3. C Bilirubin
  4. D Ammonia

Correct answer: Bilirubin

Jaundice is the yellowing of skin and sclera caused by elevated levels of bilirubin, often due to liver dysfunction, bile duct obstruction, or excessive hemolysis.

Question 58 of 60 Medium

Which of the following describes the liver's role in vitamin metabolism?

  1. A It is the primary storage site for excess Vitamin C.
  2. B It stores months' worth of Vitamin B12 and Vitamin A.
  3. C It excretes excess Vitamin K to help prevent blood clotting.
  4. D It converts Vitamin E into a lipid-soluble form.

Correct answer: It stores months' worth of Vitamin B12 and Vitamin A.

The liver is a major storage site for fat-soluble vitamins (A, D, E, K) and Vitamin B12, often holding enough to prevent deficiency for months or years.

Question 59 of 60 Medium

The 'Vagal Phase' of pancreatic secretion is mediated by the neurotransmitter:

  1. A Norepinephrine
  2. B Dopamine
  3. C Acetylcholine
  4. D Serotonin

Correct answer: Acetylcholine

The cephalic and gastric phases of digestion use the vagus nerve to release acetylcholine, which stimulates pancreatic acinar cells to secrete enzymes.

Question 60 of 60 Medium

Kupffer cells in the liver are primarily found within the:

  1. A Bile canaliculi
  2. B Hepatic sinusoids
  3. C Central vein
  4. D Perisinusoidal space of Disse

Correct answer: Hepatic sinusoids

Kupffer cells are resident macrophages attached to the luminal side of the endothelial cells in the sinusoids, where they filter the portal blood.

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