Question

Which one of the following is a voluntary action
A. Heart Beat
B. Salivation
C. Chewing
D. Digestion

Answer 1

Hint:
When an action is produced with the involvement of thoughts, it is called voluntary action. It involves actions like walking, eating, jumping, and running. These actions are produced consciously. Both the spinal cord and brain are involved and these coordinate with PNS to generate necessary movements.

Complete answer:
A voluntary action is an action which is initiated by our own conscience. The brain sends impulses from it to the effectors (muscles or glands) via the spinal cord with neurons and finally motor neurons. Chewing is an action performed by us knowingly and is, therefore, a voluntary action. So the correct option is C
Voluntary action means the action which can be controlled by us. Previously you can't find it to control your heart beatings, it is an Involuntary action. These are regulated by the autonomic nervous system. It is a set of muscles movement over which we do not have any control. Such actions are controlled by the brain. So the option A is incorrect.
Salivation means excessive secretion of saliva often accompanied by soreness of the mouth and gums. Salivation is controlled by the autonomic nervous system and is therefore involuntary actions, that is, those which are not under the control of one's will. So option B is incorrect.
Digestion is the deterioration of huge insoluble food molecules into small water-soluble food molecules so that they can be absorbed into the watery blood plasma. As this is an involuntary action. So the option D is incorrect.

Hence, option C (Chewing) is the correct option.

Note: A voluntary action is under the control of us. It is an action which is initiated by our consciousness. It is an action which is produced with the involvement of thoughts, they are called voluntary action. It involves actions like walking and running.