The regulation of pulmonary ventilation during exercise

Question 1

What 3 factors is pulmonary ventilation controlled by?

Answer 1

• Neural control (signals)
• Chemical control (acidity)
• Hormonal control (adrenaline)

Question 2

What is the process?

Answer 2

1. Anticipation of exercise (adrenaline released)
2. Exercise begins; high levels of CO2 detected by chemoreceptors
3. Change in blood pressure detected by baroreceptors
4. Movement detected by proprioceptors
5. Nerve impulses sent to medulla oblongata
6. Sympathetic nervous system stimulated
7. Increased phrenic and intercostal nerve impulses
8. Increased depth and rate of breathing
9. To maintain aerobic respiration

Question 3

What is the phrenic nerve responsible for?

Answer 3

Inspiration

Question 4

What is the intercostal nerve responsible for?

Answer 4

Expiration

Question 5

What muscles aid inspiration?

Answer 5

• Diaphragm
• External intercostals

Question 6

What muscles aid expiration?

Answer 6

• Internal intercostals