Question

Which of the following is/are voluntary muscles?
A. Skeletal
B. Cardiac
C. Smooth
D. All of the above

Answer 1

Hint: Voluntary muscles can regulate through our conscious mind. Whereas, muscles that are not under our conscious mind control are referred to as involuntary muscles. Voluntary muscles include biceps, triceps, thigh muscles, etc.

Complete answer:
There are three kinds of muscles in our body that conduct the body's various activities. Skeletal muscles, cardiac muscles and smooth muscles are these three types of muscles. In our body, skeletal muscles are voluntary muscle types, while cardiac muscles and smooth muscles are involuntary muscle types. With the assistance of reflexes, skeletal muscles promote movement in the body willingly and involuntarily.

The involuntary motion requires the movement of the arm if a person near the fire were to burn his finger as our arm would immediately travel away without our thought. A signal from our brain helps to make our body move as our muscles contract rapidly and relax to help our body move. It is only in the heart where the cardiac muscle is located. It is a type of muscle, with the smooth and striated muscles being others. Smooth muscles are not regulated willingly, i.e., they are not controlled by our own will. Striations or stripes do not occur in these muscle cells. They are thus referred to as smooth muscle cells. They are sometimes called muscles that are involuntary. There is a single nucleus in the cells and the cells are spindle-shaped.

Hence, the correct answer is option A.

Note: Examples of smooth muscles that are spontaneous and not under our conscious control include other alternatives such as food canal, eye iris and lung bronchi. As cardiac muscles are present only in the heart, heart muscles are called cardiac muscles. The cardiac muscles help in the rhythmic contraction and relaxation of the heart.