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Question

Sympathetic nervous system performs which of these following functions?


A

Decreases blood glucose, decreases peristalsis, decreases heart rate.

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B

Increases blood glucose, increases peristalsis, decreases heart rate.

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C

Decreases blood glucose, increases peristalsis, decreases heart rate.

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D

Increases blood glucose, decreases peristalsis, increases heart rate.

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Solution

The correct option is D

Increases blood glucose, decreases peristalsis, increases heart rate.


The sympathetic nervous system promotes a fight-or-flight response that corresponds with energy generation and inhibits digestion. Their functions can be listed as

1. Diverts blood flow away from the intestines.

2. Blood flow to skeletal muscles and the lungs is enhanced.

3. Dilates bronchioles of the lung which allows for greater oxygen exchange.

4. Increases heart rate, thereby providing a mechanism for enhanced blood flow to skeletal muscles.

5. Dilates pupils and relaxes the ciliary muscle to the lens, allowing more light to enter the eye and far vision.

6. Dilates the coronary vessels of the heart.

7. Inhibits peristalsis motion of the food pipe.


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