The contraction of which of the following muscle fibers, is controlled by hormones?
Correct answer: A. A smooth muscle
- A. A smooth muscle
- B. A cardiac muscle
- C. A skeletal muscle.
- D. All of these
Explanation
Smooth muscle contraction is regulated involuntarily by autonomic signals, local factors, and hormones, rather than by conscious motor commands. Students may choose cardiac muscle because hormones influence heart rate, but cardiac contraction is generated intrinsically by the pacemaker system and only modulated by hormones.
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About Muscles
Muscles covers skeletal, smooth and cardiac muscle, their microscopic structure and the roles of tendons, myofibrils, actin and myosin. It explains the sliding filament mechanism, sarcomere shortening, neuromuscular transmission and calcium regulation, while distinguishing voluntary skeletal movement from involuntary contraction in smooth and cardiac muscle.
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