question_answer 49)

  Which of the following is not an involuntary action? (a) Vomiting                       (b) Salivation                      (c) Heart beat                    (d) Chewing

Answer:

                  (d) Involuntary actions are those actions that are not under our direct control such as heart beat, breathing, peristatic movements, etc. These are controlled by medulla. Chewing is under voluntary control and controlled by lobes present in cerebral cortex.