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MCAT Biology Question — Parasympathetic Activity

  • by Kerry Goldstein
  • Jan 12, 2015
  • MCAT Biology, MCAT Blog, MCAT Question of the Day

Which of the following will happen in response to a stimuli which generates increased parasympathetic activity?

I. Increased cardiac output

II. Vasoconstriction in skeletal muscle arterioles

III. Increased gut motility

A) II only

B) III only

C) I and II only

D) II and III only

 

 

 

Explanation

I. Increased cardiac output

II. Vasoconstriction in skeletal muscle arterioles

III. Increased gut motility

A) II only

B) III only

C) I and II only

D) II and III only

The parasympathetic nervous system is activated when the body is at rest. The sympathetic nervous system is the “fight or flight” response. When the body is at rest, the heart rate and contractility will decrease, thus (I) is not true. Blood will be directed away from the muscles and to the digestive system, and digestive activity will increase. Thus (II) and (III) are true, making (D) the right answer.

 

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