Question

Sympathetic nervous system induces
A. Heart beat
B. Secretion of semen
C. Secretion of saliva
D. Secretion of digestive juices

Answer 1

Hint: Sympathetic nervous system is the part of the autonomic nervous system. It regulates the involuntary actions. The heartbeat cannot be regulated by the central nervous system. It is the involuntary action. Secretion of various fluid substances in the body is regulated by C.N.S.

Complete answer:
Human body works on two systems: the central nervous system and the peripheral nervous system. The autonomic nervous system is included in the peripheral nervous system. It regulates the involuntary physiologic processes. The autonomic nervous system is mainly divided into two branches: the sympathetic, parasympathetic nervous system. The sympathetic division maintains the homeostasis of internal organs and initiates the stress response. It maintains the neuronal and hormonal response in stressful situations. It is known as fight or flight response or sympatho-adrenal response. It initiates or activates the secretion of adrenaline and nor-adrenaline. It is constantly active in the body.
Secretion of saliva, semen and digestive juices are not the part of involuntary actions. These are regulated by the brain or spinal cord which is the part of the central nervous system. These responses depend on the health of the human body. From the above information we know that sympathetic nervous system induces heart beat.

Hence, the correct answer is option (A).

Note: Autonomic nervous also includes another branch that is the enteric nervous system. Some other responses regulated by the sympathetic nervous system are widening bronchial passages, decreasing motility of large intestine, dilation of pupils, and causing perspiration. Hormones play a very important role in the secretion of digestive juices. These are secreted from the endocrine glands. Pituitary gland regulates the secretion of hormones.