The pneumotaxic center controls which of the following? a. ...

[Anajune7]

The pneumotaxic center controls which of the following?
 
  a. Response to changes in blood pH and PCO2
  b. Rhythm of the full breathing cycle
  c. When inspiration switches off (the inspir-atory time)
  d. When inspiration switches on (the expira-tory time)

Question 2

The medulla oblongata contains which of the following areas? 1. Apneustic center 2. Dorsal respiratory group neurons (DRGs) 3. Pneumotaxic center 4. Ventral respiratory group neurons (VRGs)
 
  a. 1, 2, and 3 only
  b. 2 and 4 only
  c. 3 only
  d. 1, 3, and 4 only

[Heffejeff]

Answer to Question 1

ANS: C
The pneumotaxic center controls the switch-off point of the inspiratory ramp, thus controlling inspiratory time.

Answer to Question 2

ANS: B
Instead, the medulla contains several widely dispersed respiratory-related neurons, as shown in Figure 15-1. The DRGs contain mainly inspiratory neurons, whereas the VRGs contain both in-spiratory and expiratory neurons.

[Anajune7]

TYSM

[EAN94]

Excellent