Exam 6: Control of Respiration

Question 1

What is the function of the dorsal respiratory group?

Answer 1

Control inspiration

Question 2

What is the function of the ventral respiratory group?

Answer 2

Controls inspiration and expiration

Question 3

How do the central chemoreceptors sense changes in O2?

Answer 3

CO2 induced respiratory drive, so it doesn’t actually sense changes in O2 directly but rather CO2

Question 4

Where are the peripheral chemoreceptors located?

Answer 4

Carotid bodies (located bilaterally in the bifurcation of the common carotid arteries)
Aortic bodies (located along the aortic arch)

Question 5

What is the primary stimulus for ventilation in a healthy patient?

Answer 5

PCO2

Question 6

At what PO2 does hypoxic drive become significant?

Answer 6

When it drops below 60-70 mmHg