Question

Neural stimulation in visceral organ in human beings is done by

• A. Sympathetic and parasympathetic nerves and is under involuntary action
• B. Sympathetic nerves and is under voluntary action
• C. Sympathetic and parasympathetic nerves and is under voluntary action
• D. Parasympathetic nerves and is under voluntary action

Answer 1

The correct option is A Sympathetic and parasympathetic nerves and is under involuntary action

Autonomic motor nerves innervate organs whose functions are not usually under voluntary control. The sympathetic and parasympathetic divisions of the autonomic system affect the visceral organs in different ways. Mass activation of the sympathetic system prepares the body for intense physical activity in emergencies and stress (physically or mentally); the heart rate increases, blood glucose level rises, and blood is diverted to the skeletal muscles (away from the visceral organs and skin). The effects of parasympathetic nerve stimulation are in many ways opposite to the effects of sympathetic stimulation. Stimulation of separate parasympathetic nerves can result in a slowing of the heart, dilation of visceral blood vessels, and an increased activity of the digestive tract.