Which of the following centers responds more strongly to high ...

[mp14]

Which of the following centers responds more strongly to high levels of CO2?
 
  a. Aortic chemoreceptors
  b. Carotid chemoreceptors
  c. Central chemoreceptors
  d. Ventral respiratory centers

Question 2

In the face of hyperoxia, what is the response of the peripheral chemoreceptors to hypercapnia?
 
  a. There is a decreased drive to breathe.
  b. There is an increased drive to breathe.
  c. There is insufficient information.
  d. There is virtually no response.

[tmlewis4706]

Answer to Question 1

ANS: C
For a given increase in PaCO2 or hydrogen ion concentration, the carotid bodies are less respon-sive than the central chemoreceptors. The peripheral chemoreceptors account for only 20 to 30 of the ventilatory response to hypercapnia.

Answer to Question 2

ANS: D
High arterial PO2 (hyperoxia) decreases the peripheral chemoreceptors' PCO2 sensitivity to al-most zero.

[mp14]

Thanks for the timely response, appreciate it

[tranoy]

Excellent