Week 10: Respiratory 5

Question 1

What is the diaphragm innervated by?

Answer 1

the phrenic nerve

Question 2

What does the Pre-Bot zinger complex do?

Answer 2

forms the action potential that drives breathing movement

Question 3

What are the respiratory neural groups?

Answer 3

DRG (dorsal)

VRG (ventral)

PRG (pontine)

Question 4

Draw the diagram summarizes the wiring of the brainstem ventilatory control. Describe A, B and C

Answer 4

A: results in inspiration

B: provides info about the stretching of the lung

more stretched = more firing

C: inhibits A

* all of this ensures proper frequency of breathing *

Question 5

What controls breathing?

Answer 5

chemoreceptors

Question 6

Where are the three CO₂ sensitive areas located?

Answer 6

posteriorly on the medulla next to the basilar artery

(R, I, and C)

Question 7

How do the chemorecptors adjust breathing?

Answer 7

↑PCO₂ = ↓pH

as PCO₂ increases more HCO₃^- is produced therefore more H⁺ are produced which will decrease the pH

Question 8

What receptors sense hypoxia? Where are they located?

Answer 8

peripheral chemoreceptors located in the aortic arch and carotid sinus

Question 9

What is the normal PCO₂ ?

Answer 9

40 mmHg

Question 10

What is the graph displaying the effect of H⁺ on ventillatory response?

Answer 10

↓ pH = ↑ rate of breathing (during exercise)

↑ pH = ↓ rate of breathing