Lecture 9-control of ventilation

Question 1

define minute ventilation

Answer 1

breathing frequency*tidal volume (usually 5L/min)

Question 2

Name 3 instances breathing rate would vary according to need

Answer 2

exercise, altitude, disease(compromising gas exchange)

Question 3

Where is the respiratory centre located in the brain

Answer 3

Medulla Oblongata and Pons region (regulates medulla)

Question 4

What does the ventral respiratory group contains and what does it do

Answer 4

Contains mixed neurones
some fire during inspiration,
some during expiration

Question 5

What does the dorsal respiratory group contains and what does it do

Answer 5

Contains neurones

which fire during inspiration

Question 6

what does the Pneuomotaxic centre do?

Answer 6

acts on the DRG to inhibit respiratory neurones

Question 7

what does the Apneustic centre do?

Answer 7

acts of the DRG to stimulate respiratory neurones

Question 8

What affect does the cortical part of the higher brain centre have on breathing

Answer 8

voluntary hyperventilation (alkalosis), voluntary breath holding ( hypoxia)

Question 9

What affect does the hypothalamic part of the higher brain centre have on breathing

Answer 9

emotions- hyperventilation when angry ect.

sensory-hyperventilation when cold ect.