Question

Malcolm is studying alone in his room late at night when he hears a loud noise downstairs. His heartbeat increases significantly and his breathing becomes shallow. He wonders if a burglar has entered the house and decides to investigate. When he gets downstairs he discovers his cat has knocked over a plantstand. His body begins to relax and return to normal.
Which part of his nervous system is responsible for returning Malcolm to a normal state?

A) Spinal cord
B) Somatic nervous system
C) Sympathetic nervous system
D) Parasympathetic nervous system

Answer 1

The correct answer would be option D, Parasympathetic Nervous System.

His body begins to relax and return to normal. Parasympathetic Nervous System is responsible for returning Malcolm to a normal state.

Explanation:

Parasympathetic Nervous System is a part of the Nervous System. This is also called as the rest and digest system.

This part of the nervous system helps in slowing down the heart rate, intestinal and glands activities increases, and sphincter muscles in the gastrointestinal tract relaxes.

This part works with the sympathetic nervous system. Sympathetic nervous system is responsible for the increase of heart rate, whereas Parasympathetic nervous system is responsible for slowing down the heart rate.

The heart rate usually rises during the feeling of fear, excitement, working out, etc. For example during a flight, the heart rate increases due to sympathetic nervous system and comes back to normal rate through parasympathetic nervous system. Similarly when Malcolm comes to know that the sound was produced by the cat, his body came back to his normal state due to the Parasympathetic Nervous System.

Learn more about Parasympathetic Nervous System at:

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