THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Vomiting, salivation and heartbeat are involuntary actions under the influence of the autonomic nervous system. These actions are not under the control of one’s will.

Detailed explanation-2: -So, the correct answer is ‘Chewing’

Detailed explanation-3: -Actions which take place without consciousness or willingness of an individual are called the involuntary action. Digestion, heart beating, sneezing, etc are few examples of involuntary actions. Both involuntary and voluntary actions are controlled by the same parts of the brain.

Detailed explanation-4: -A voluntary action is under the control of one’s will, means under the control of the brain. Example-Dancing, Eating, Writing, etc. An involuntary action is not under the control of one’s will, it is controlled by the spinal cord. Example-Breathing, Respiration, Blinking eyelids etc.