Question

Which one of the following demonstrates the characteristics of cardiac muscle cells?
A. Involuntary and multinucleated
B. Unbranched and uninucleated
C. Cylindrical and uninucleated
D. Unbranched and involuntary

Answer 1

Cardiac muscle which is also called myocardium or heart muscle is one of the types of muscles found in vertebrates. Cardiac muscles are present only in the heart. It constitutes the main tissue that surrounds the wall of the heart.

Complete answer: The soft tissue which is found in most of the animals is called muscles. Protein filaments called actin and myosin are responsible for the contraction and relaxation of the muscle. The function of the muscle is to produce force and motion. Three types of muscle tissue are found in vertebrates. They are skeletal muscle, smooth muscle, and cardiac muscle. The skeletal muscle which is also called voluntary muscle is mainly attached to the bones and tendons in order to regulate the function of locomotion and maintain the posture of the body. Skeletal muscles are unbranched, multinucleated, and cylindrical in shape. All the voluntary actions of the body are controlled by the skeletal muscles. Smooth muscles are also called involuntary muscles. They are found within the inner lining of the organs and structures such as the stomach, oesophagus, bronchi, uterus, intestines, urethra, urinary bladder, and blood vessels. Smooth muscles are not under conscious control like the one skeletal muscles. Smooth muscles are fusiform in shape and uninucleated. Cardiac muscles are also involuntary muscles but are found only in the heart. Cardiac muscles are branched and cylindrical in shape. They are uninucleate cells.
So, option C is the correct option.

Note: The contraction and relaxation of the cardiac muscle is similar to that of the skeletal muscles but has some differences. The cardiac cells of the heart are specialized excitable cells that are able to induce electrical impulses and give rise to the action potential. Cardiac muscle cells are also called cardiomyocytes.