Pulmonary ventilation during exercise

Question 1

What is pulmonary ventilation?

Answer 1

• Breathing

Question 2

What are the 3 factors that control pulmonary ventilation?

Answer 2

1. Neural control
2. Chemical control
3. Hormonal control

Question 3

1. Neural control

Answer 3

• Brain & nervous system.
• Increase in sympathetic/ phrenic/ intercostal nerve signals.

Question 4

2. Chemical control

Answer 4

• Chemoreceptors detect a rise in acidity due to CO2 and lactic acid.

Question 5

3. Hormonal control

Answer 5

• Release of adrenaline.
• In order to prepare you for exercise- anticipatory rise.

Question 6

The process (pt.1)

Answer 6

1. Anticipation of exercise- release of adrenaline.
2. Exercise begins- increased acidity and CO2 in blood is detected by chemoreceptors.
3. Movement is detected by proprioceptors.
4. Decrease in blood pressure is detected by the baroreceptors.

Question 7

The process (pt.2)

Answer 7

5. Signals are sent to the medulla oblongata.
6. Sympathetic nervous system is stimulated (prepare for exercise).
7. Increased phrenic and intercostal nerve impulses.
8. Increased depth and rate of breathing.
9. More O2 to muscles to maintain aerobic respiration.

Question 8

Phrenic nerve

Answer 8

• Inspiration.

Question 9

Intercostal nerve

Answer 9

• Expiration

Question 10

What muscles work in the phrenic nerve?

Answer 10

• Diaphragm, External intercostals.

Question 11

What muscles work in the intercostal nerve?

Answer 11

• Internal intercostals.