Organ System Integration Practice Questions
40 free Organ System Integration practice questions for the NCERT Biology. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Organ system integration in animals primarily ensures that:
- A Each organ system functions independently
- B Different systems work in coordination
- C Only the nervous system controls the body
- D Metabolic reactions occur at random
Correct answer: Different systems work in coordination
Organ system integration allows different organ systems to coordinate their functions. This coordination maintains internal balance and ensures survival.
Which two systems are most directly involved in the transport of oxygen to body tissues?
- A Digestive and excretory systems
- B Respiratory and circulatory systems
- C Nervous and endocrine systems
- D Muscular and skeletal systems
Correct answer: Respiratory and circulatory systems
The respiratory system takes in oxygen, while the circulatory system transports it to tissues. Their integration ensures efficient oxygen delivery.
The coordination between nervous and muscular systems results in:
- A Hormone secretion
- B Coordinated body movement
- C Digestion of food
- D Filtration of blood
Correct answer: Coordinated body movement
Nervous impulses stimulate muscle fibers to contract or relax. This coordination produces controlled body movements.
Which system plays a major role in integrating responses through chemical messengers?
- A Nervous system
- B Digestive system
- C Endocrine system
- D Excretory system
Correct answer: Endocrine system
The endocrine system releases hormones into the bloodstream. These chemical messengers regulate and integrate body functions over time.
During physical exercise, which systems work together to meet increased energy demand?
- A Nervous, endocrine, and reproductive
- B Respiratory, circulatory, and muscular
- C Digestive, excretory, and nervous systems
- D Skeletal, digestive, and integumentary
Correct answer: Respiratory, circulatory, and muscular
Exercise increases oxygen and nutrient demand in muscles. Respiratory, circulatory, and muscular systems coordinate to meet this demand.
The integration of digestive and circulatory systems helps in:
- A Gas exchange between tissues
- B Absorption and transport of nutrients
- C Removal of nitrogenous waste products
- D Hormonal regulation of growth
Correct answer: Absorption and transport of nutrients
The digestive system breaks down food and absorbs nutrients. The circulatory system then transports these nutrients to body cells.
Which system links the external environment to internal body responses most rapidly?
- A Endocrine system
- B Circulatory system
- C Nervous system
- D Immune system
Correct answer: Nervous system
The nervous system transmits electrical impulses rapidly. This allows quick responses to changes in the external environment.
Removal of metabolic wastes requires integration mainly between which systems?
- A Digestive and nervous only
- B Respiratory and muscular systems
- C Circulatory and excretory
- D Skeletal, endocrine, and immune
Correct answer: Circulatory and excretory
The circulatory system carries wastes to excretory organs. The excretory system then removes these wastes from the body.
Which system provides structural support and protection while working with muscles for movement?
- A Circulatory system
- B Skeletal system
- C Respiratory system
- D Immune system
Correct answer: Skeletal system
The skeletal system provides a rigid framework. Muscles attached to bones produce movement through coordinated action.
Homeostasis in animals is best achieved by integration of:
- A Only nervous system
- B Only endocrine system
- C Nervous and endocrine systems
- D Digestive and reproductive systems
Correct answer: Nervous and endocrine systems
Both nervous and endocrine systems regulate body functions. Their combined action maintains stable internal conditions.
Which system ensures coordination between different organs through electrical signals?
- A Endocrine system
- B Circulatory system
- C Nervous system
- D Immune system
Correct answer: Nervous system
The nervous system uses electrical impulses for rapid communication. This allows precise coordination among organs.
Integration of respiratory and circulatory systems is essential for:
- A Digestion
- B Thermoregulation in skin
- C Cellular respiration
- D Urine filtration process
Correct answer: Cellular respiration
Respiratory system supplies oxygen and removes carbon dioxide. Circulatory system delivers oxygen to cells for cellular respiration.
Which organ system works closely with the immune system to transport immune cells?
- A Digestive system
- B Circulatory system
- C Respiratory system
- D Skeletal system
Correct answer: Circulatory system
The circulatory system transports white blood cells throughout the body. This supports immune defense and response.
The coordinated action of kidneys, lungs, and blood helps regulate:
- A Skin pigmentation
- B Blood pH balance
- C Visual acuity
- D Overall growth rate
Correct answer: Blood pH balance
Kidneys and lungs regulate acid-base balance by removing acids or bases. Blood acts as the transport medium in this regulation.
Which system integrates sensory input and motor output?
- A Lymph system
- B Digestive system
- C Nervous system
- D Excretory system
Correct answer: Nervous system
The nervous system receives sensory information and sends motor commands. This integration produces appropriate responses.
Which of the following best represents integration at the organ system level?
- A Cells forming tissues
- B Tissues forming organs
- C Organs working together
- D Organs functioning independently
Correct answer: Organs working together
Organ system integration occurs when different organs work together. This coordination enables complex physiological functions.
Which system supports other systems by supplying energy-rich nutrients?
- A Digestive system
- B Respiratory system
- C Excretory system
- D Nervous system
Correct answer: Digestive system
The digestive system breaks down food into nutrients. These nutrients supply energy to all body systems.
Failure of integration between organ systems would most directly affect:
- A Cell division rate only
- B Overall body coordination
- C Presence of tissues alone
- D Genetic material and replication
Correct answer: Overall body coordination
Without proper integration, organ systems cannot coordinate. This disrupts normal body functions and survival.
Which system connects the body to its environment by receiving stimuli?
- A Immune system
- B Nervous system
- C Circulatory system
- D Reproductive system
Correct answer: Nervous system
The nervous system detects external stimuli through sensory receptors. It integrates this information to generate responses.
Overall integration of organ systems in animals results in:
- A Independent and redundant organ activity
- B Increased complexity and efficiency
- C Reduced metabolic rate throughout
- D Random and unpredictable responses
Correct answer: Increased complexity and efficiency
Integration allows organ systems to function together efficiently. This increases complexity and adaptability of animal bodies.
Which of the following processes best illustrates the functional integration between the respiratory and circulatory systems?
- A Peristaltic movement of food
- B Filtration of nitrogenous wastes by the kidneys
- C Production of antibodies by lymphocytes
- D Transport of oxygen from alveoli to tissues
Correct answer: Transport of oxygen from alveoli to tissues
The respiratory system provides the surface for gas exchange, while the circulatory system acts as the transport medium to deliver that oxygen to every cell in the body.
During heavy physical exercise, the increase in the rate of respiration is coordinated with an increase in heart rate. This is an example of:
- A Mechanical digestion
- B Long-term evolutionary adaptation
- C Passive transport
- D Organ system integration
Correct answer: Organ system integration
To meet the increased oxygen demand of muscles during exercise, the nervous system coordinates an increase in both breathing and blood flow simultaneously.
Which two systems work most closely together to regulate the pH of the blood and maintain homeostasis?
- A Integumentary and Muscular
- B Digestive and Reproductive
- C Respiratory and Excretory
- D Skeletal and Immune
Correct answer: Respiratory and Excretory
The respiratory system regulates pH by exhaling CO2, and the excretory system (kidneys) regulates pH by excreting hydrogen ions and reabsorbing bicarbonate.
The endocrine system achieves long-term integration of organ functions primarily through:
- A Electrical impulses
- B Direct physical contact between organs
- C Ciliary movement in ducts
- D Chemical messengers called hormones
Correct answer: Chemical messengers called hormones
Hormones are secreted into the blood and travel to target organs to provide a coordinated, chemical-based regulation of various physiological processes.
Which system provides the mineral framework required for the muscular system to effect locomotion?
- A Circulatory system
- B Nervous system
- C Excretory system
- D Skeletal system
Correct answer: Skeletal system
The skeletal system provides points of attachment for muscles and the rigid levers necessary for movement, illustrating the integration of the musculoskeletal system.
The 'Fight or Flight' response involves the rapid integration of which systems to prepare the body for action?
- A Digestive and Reproductive
- B Excretory, Integumentary, and Skeletal
- C Skeletal and Respiratory only
- D Nervous, Endocrine, and Circulatory
Correct answer: Nervous, Endocrine, and Circulatory
The nervous system triggers the adrenal glands (endocrine) to release adrenaline, which then increases heart rate (circulatory) to prepare the body for stress.
Nutrients absorbed by the digestive system are delivered to the liver for processing via the:
- A Lymphatic vessel network
- B Pulmonary artery
- C Hepatic portal system
- D Renal vein
Correct answer: Hepatic portal system
The hepatic portal system is a specialized circulatory link that integrates the digestive tract and the liver for nutrient regulation.
Which system acts as the primary 'fast-acting' integrator by processing sensory information and sending motor commands?
- A Endocrine system
- B Circulatory system
- C Nervous system
- D Muscle system
Correct answer: Nervous system
The nervous system uses electrical signals (action potentials) to provide near-instantaneous coordination and response to environmental stimuli.
Thermoregulation in mammals involves the integrated effort of which components?
- A Sweat glands, blood vessels, and the hypothalamus
- B Stomach, lungs, and kidneys
- C Bones, muscles, and ligaments
- D The ovaries, the testes, as well as the pituitary gland
Correct answer: Sweat glands, blood vessels, and the hypothalamus
The hypothalamus (nervous) senses temperature and triggers responses in the skin (sweat glands) and circulatory system (vasodilation) to maintain a constant body temperature.
The absorption of fats from the digestive tract into the blood requires the intermediate integration of the:
- A Excretory system
- B Respiratory system
- C Lymphatic system
- D Skeletal system
Correct answer: Lymphatic system
Large fat molecules are absorbed into lacteals of the lymphatic system before being emptied into the venous blood circulation.
Which system provides the oxygen necessary for the cellular respiration that powers muscle contraction?
- A Respiratory system
- B Excretory system
- C Digestive system
- D Integumentary system
Correct answer: Respiratory system
The respiratory system intake of oxygen is vital for the production of ATP in muscle cells, which is required for the integration of movement.
Integration at the level of 'Internal Environment' maintenance is best defined by the term:
- A Homeostasis
- B Metabolism
- C Phagocytosis
- D Metamorphosis
Correct answer: Homeostasis
Homeostasis is the state of steady internal, physical, and chemical conditions maintained by living systems through complex organ system integration.
The coordination between the hypothalamus and the pituitary gland represents an integration between:
- A Nervous and Endocrine systems
- B Circulatory and Respiratory systems
- C Excretory and Digestive systems
- D Muscular and Skeletal systems
Correct answer: Nervous and Endocrine systems
The hypothalamus (brain) controls the pituitary gland (master endocrine gland), forming the neuroendocrine axis that regulates most body functions.
When the blood glucose level rises, the integration between the pancreas and the circulatory system results in the release of:
- A Insulin
- B Glucagon
- C Adrenaline
- D Thyroxine
Correct answer: Insulin
The pancreas senses high glucose in the blood (circulatory) and releases insulin to lower it, demonstrating functional integration for metabolic balance.
The movement of food through the esophagus is an integrated action involving:
- A Smooth muscles and the autonomic nervous system
- B Skeletal muscles and the somatic nervous system
- C Cardiac muscles and hormones
- D Bone marrow and blood pressure
Correct answer: Smooth muscles and the autonomic nervous system
Peristalsis is an involuntary muscular contraction coordinated by the nervous system to move food along the digestive tract.
Which system protects all other organ systems from external injury and desiccation?
- A Integumentary system
- B Cardiovascular system
- C Immune system
- D Lymphatic system
Correct answer: Integumentary system
The skin (integumentary system) serves as the primary barrier that protects the internal environment and all integrated organ systems from the outside world.
The integration of the 'Renal Portal System' in lower vertebrates primarily involves which two systems?
- A Nervous and Excretory
- B Circulatory and Excretory
- C Digestive and Respiratory
- D Endocrine and Muscular
Correct answer: Circulatory and Excretory
The renal portal system is a circulatory modification where blood from the hind limbs is routed through the kidneys (excretory) before reaching the heart.
A failure in the coordination between the 'medulla oblongata' and the 'diaphragm' would most directly stop:
- A Blood clotting
- B Breathing
- C Digestion
- D Nerve conduction
Correct answer: Breathing
The medulla oblongata (nervous) contains the respiratory center that sends signals to the diaphragm (muscular) to initiate breathing.
Which system transports the metabolic wastes produced by the muscular system to the excretory system?
- A Respiratory system
- B Circulatory system
- C Digestive system
- D Skeletal system
Correct answer: Circulatory system
The circulatory system acts as a link, picking up wastes like urea and CO2 from tissues and delivering them to the kidneys and lungs for removal.
In the context of 'Structural Organisation', which level of organization comes immediately after the 'Organ System' level in the hierarchy?
- A Tissue level
- B Organ level
- C Organism level
- D Cellular level
Correct answer: Organism level
When various organ systems integrate and work together in a coordinated manner, they form the complete 'Organism'.