Control of Breathing

Question 1

3 elements to the respiratory control system

Answer 1

1. Sensors (gather info)
2. Central controller (in brain - coordinates info and sends impulses)
3. Effectors (respiratory muscles - affect ventilation)

Question 2

2 control centers in the pons

Answer 2

Pneumotaxic center
Apneustic center
These ones regulate fine tuning that is happening in the medulla

Question 3

What does the
1. Dorsal respiratory group
2. Ventral respiratory group
control?

Answer 3

1. Inspiratory neurons

2. Inspiratory and expiratory (accessory muscles for expiration)

Question 4

Which nerve innervates the diaphragm?

Answer 4

Phrenic

Question 5

Aortic and carotid bodies contain…

Answer 5

Baroreceptors (pressure - ppO2 and CO2)
Peripheral chemoreceptors (pH)

Question 6

What are 3 things that peripheral chemoreceptors respond to?

Answer 6

1. Significantly decreased PO2 (hypoxia)
2. Increased H+ concentration (metabolic acidosis)
3. Increased PCO2 (respiratory acidosis)