Question

Sympathetic nervous system stimulation _____.

• A. Increases blood glucose, decreases GI peristalsis, increases heart rate and BP.
• B. Decreases blood glucose, increases GI peristalsis, decreases heart rate and BP.
• C. Increases blood glucose, increases GI peristalsis, decreases heart rate and BP.
• D. Decreases blood glucose, decreases GI peristalsis, decreases heart rate and BP.

Answer 1

The correct option is A

Increases blood glucose, decreases GI peristalsis, increases heart rate and BP.

The sympathetic nervous system promotes a fight-or-flight response, corresponds with arousal and energy generation, and inhibits digestion

1. Diverts blood flow away from the gastrointestinal (GI) tract and skin via vasoconstriction

2. Blood flow to skeletal muscles and the lungs is enhanced (by as much as 1200% in the case of skeletal muscles)

3. Dilates bronchioles of the lung through circulating epinephrine, which allows for greater alveolar oxygen exchange

4. Increases heart rate and the contractility of cardiac cells (myocytes), 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. Provides vasodilation for the coronary vessels of the heart

7. Constricts all the intestinal sphincters and the urinary sphincter

8. Inhibits peristalsis