Tissue types and function · USMLE Step 1

Which type of muscle tissue is characterized by involuntary contraction, absence of striations, and is found lining hollow organs such as the intestines and blood vessels?

  1. Skeletal muscle
  2. Cardiac muscle
  3. Smooth muscle
  4. Striated muscle
Show answer and explanation

Correct answer: Smooth muscle

Smooth muscle is non-striated, under involuntary control, and comprises the muscle layer of hollow organs (e.g., gastrointestinal tract, blood vessels), enabling changes in lumen diameter and organ motility.

Difficulty: Medium Question 16 of 22

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