Question

Which muscles are striated?A. cardiac muscle and nerve muscleB. cardiac muscle and smooth muscleC. skeletal muscle and cardiac muscleD. skeletal muscle and smooth muscle

Answer 1

Striated muscles include both skeletal muscles, which are under voluntary control, and cardiac muscles, which are found only in the heart and are involuntary. Smooth muscles, on the other hand, are non-striated and also operate involuntarily.

Step-by-step explanation:

The muscles that are striated are the skeletal muscles and the cardiac muscles. Both skeletal and cardiac muscles have their filaments arranged in a regular pattern called sarcomeres, which gives them a striped appearance when viewed under a microscope. This is why they appear striated. However, while skeletal muscles are under voluntary control, cardiac muscle, which is found only in the heart, operates involuntarily and is regulated by the autonomic nervous system.

In contrast, smooth muscles do not have striations since their cells are arranged in sheets rather than in the bundle arrangement seen in striated muscle. Thus, they appear non-striated and are also under involuntary control, contributing to various functions such as controlling the flow of blood and maintaining blood pressure.

Answer 2

The correct option is C. Skeletal muscle and cardiac muscle.