Practice Questions

Correct: Intercalated discs synchronize contraction, while abundant mitochondria provide continuous ATP for rhythmic activity. A: Cardiac muscle is rich in mitochondria. C: It is involuntary. D: Spindle-shaped cells are characteristic of smooth muscle. Concept: Functional adaptations of cardiac muscle.

Correct: Skeletal muscle fibers are multinucleated with peripheral nuclei and visible striations. A: Cardiac muscle has one or two central nuclei. B: Smooth muscle lacks striations. D: Epithelial tissue is not muscle. Concept: Microscopic characteristics of skeletal muscle.

Correct: Skeletal muscles attach to bones and produce voluntary body movements while maintaining posture. A: Smooth muscle controls internal organs. B: Cardiac muscle pumps blood. D: Visceral muscle refers to smooth muscle. Concept: Functional role of skeletal muscle.

Correct: Cardiac and smooth muscles function without conscious control. A: Only skeletal muscle is voluntary. C & D: These statements are incorrect. Concept: Voluntary vs. involuntary muscle control.

Correct: Both possess striations, but skeletal muscle is voluntary while cardiac muscle is involuntary. A: Cardiac muscle is usually uninucleate. C: Skeletal muscle is striated. D: Skeletal muscle is attached mainly to bones. Concept: Comparison of skeletal and cardiac muscles.

Correct: Branched fibers and intercalated discs are unique features of cardiac muscle. A: Smooth muscle is non-striated and spindle-shaped. B: Skeletal muscle is unbranched and multinucleated. D: Dense connective tissue lacks muscle fibers. Concept: Histological identification of muscle types.

Correct: Smooth muscle cells are fusiform (spindle-shaped), uninucleate, and lack striations. A & D: Describe skeletal muscle. B: Describes cardiac muscle. Concept: Morphology of muscle tissues.

Correct: Intercalated discs electrically and mechanically connect cardiac muscle cells, allowing synchronized contractions. A: Cardiac muscle is involuntary. C: Cardiac muscle is not attached to bones. D: Cardiac muscle contains numerous mitochondria. Concept: Adaptations of cardiac muscle.

Correct: Smooth muscle in the walls of the digestive tract performs involuntary peristalsis. A: Skeletal muscle controls voluntary movement. B: Cardiac muscle is restricted to the heart. D: Tendons connect muscles to bones. Concept: Functional significance of smooth muscle.

Correct: Skeletal muscle is striated due to the organized arrangement of actin and myosin filaments. A: Smooth muscle also has a single central nucleus. B: Skeletal muscle is voluntary. D: Spindle-shaped cells are characteristic of smooth muscle. Concept: Structural comparison of muscle types.