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Author Question: Considering the negative feedback system for the control of blood pressure, when a blood pres-sure ... (Read 33 times)

futuristic

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on: Jul 16, 2018
Considering the negative feedback system for the control of blood pressure, when a blood pres-sure rise is noted in the arterial receptors, what is the expected response?
 
  a. Arterial vasoconstriction
  b. Decreased inotropic state
  c. Increased heart rate
  d. Venoconstriction

Question 2

In order to function effectively, the central cardiovascular control center must receive signals re-garding changes in blood volume or pressure. From where do these signals come?
 
  a. Central chemoreceptors
  b. Hypothalamus
  c. Peripheral baroreceptors
  d. Skeletal muscles


angrybirds13579

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: B
In the case of the arterial receptors, a rise in blood pressure increases aortic and carotid receptor stretch, and thus the discharge rate. The increased discharge rate causes an opposite response by the medullary centers (i.e., a depressor response). Venomotor tone decreases, blood vessels dilate, and heart rate and contractility both decrease.

Answer to Question 2

ANS: C
The greater the blood pressure, the greater is the stretch and the higher is the rate of neural dis-charge from the peripheral baroreceptors to the cardiovascular centers in the medulla.


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