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Chapter 14: Problem 7

Give 3 effects of the action of the sympathetic nervous system.

Short Answer

Expert verified
The three effects of the action of the sympathetic nervous system are: 1) Increased heart rate, 2) Dilation of pupils, and 3) Redistribution of blood flow.

Step by step solution

01

Identify the function of the Sympathetic Nervous System

The sympathetic nervous system is a part of the autonomic nervous system, which helps to maintain homeostasis in the body. It is often associated with the 'fight or flight' response.
02

State first effect

One effect of the activation of the sympathetic nervous system is an increase in heart rate. This is due to the release of neurotransmitters like norepinephrine which stimulate the heart muscle.
03

State second effect

A second effect can be dilation of pupils, which allows more light to enter the eye, thus improving vision during a 'fight or flight' response.
04

State third effect

A third effect is the constriction of blood vessels in certain areas and dilation in others. This redistributes blood flow towards your muscles and away from less critical areas like the skin.

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