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Human cardiac muscle differs from skeletal muscle because it:A.appears striated.B.requires acetylcholine to contract.C.contains intercalated discs.D.contains cells with multiple nuclei.

Question

Human cardiac muscle differs from skeletal muscle because it:A.appears striated.B.requires acetylcholine to contract.C.contains intercalated discs.D.contains cells with multiple nuclei.

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Solution

Human cardiac muscle differs from skeletal muscle because it contains intercalated discs.

Here's a step-by-step explanation:

A. Both cardiac and skeletal muscles appear striated, so this is not a distinguishing feature.

B. Both cardiac and skeletal muscles require acetylcholine to contract, so this is also not a distinguishing feature.

C. Intercalated discs are unique to cardiac muscle. They are specialized structures that enhance the speed and coordination of electrical signal conduction and mechanical contraction across the heart. This is the correct answer.

D. Unlike skeletal muscle cells, which have multiple nuclei, cardiac muscle cells typically have only one nucleus. However, the presence of multiple nuclei is not a distinguishing feature of cardiac muscle, as some cardiac muscle cells can also have more than one nucleus.

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