PHYSIOLOGY
MICROSCOPIC MUSCLE ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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smooth muscle
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skeletal muscle
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cardiac muscle
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diaphragm
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Detailed explanation-1: -Smooth muscle cells are spindle shaped, have a single, centrally located nucleus, and lack striations. They are called involuntary muscles. Cardiac muscle has branching fibers, one nucleus per cell, striations, and intercalated disks. Its contraction is not under voluntary control.
Detailed explanation-2: -The myocardium is the muscular tissue responsible for the contraction of the heart, and intercalated discs are present in this layer (Sommer and Waugh 1978).
Detailed explanation-3: -Cardiac muscle cells are branched and contain intercalated discs, which skeletal muscles do not have.
Detailed explanation-4: -Smooth muscle fibers are located in walls of hollow visceral organs (such as the liver, pancreas, and intestines), except the heart, appear spindle-shaped, and are also under involuntary control.