Deck 25: Control of Respiration

Question 1

Irritant receptors in the lower airway respond to all of the following except:

A)Chemical vapors.
B)Physical factors.
C)Distortion of the alveolar walls.
D)Particles.

Answer 1

C

Question 2

Mild-moderate exercise is associated with:

A)Increases in arterial partial pressure of carbon dioxide (Pco₂).
B)Decreases in arterial Po₂.
C)Normal pH.
D)Lactic acidosis.
E)Anaerobic metabolism.

Answer 2

C

Question 3

Carotid sinus nerve activity is increased in the presence of:

A)High O₂ levels in the blood.
B)Normal CO₂ levels in the blood.
C)Low O₂ content.
D)Low pH.

Answer 3

D

Question 4

The respiratory "pacemaker" is located in:

A)The dorsal respiratory group.
B)The ventral respiratory group.
C)The cerebral cortex.
D)Chest wall joints and muscles.

Question 5

The respiratory control center is located in:

A)The cerebral cortex.
B)The pons.
C)The medulla oblongata.
D)The cerebellum.

Question 6

The ventilatory response to CO₂ is enhanced by:

A)Hypoxia.
B)Alkalosis.
C)Sleep.
D)Barbiturates.

Question 7

Increased activity in the neurons in the dorsal respiratory group is associated with:

A)High lung volume.
B)High levels of CO₂ in the blood.
C)High levels of O₂ in the blood.
D)Breath holding.

Question 8

The Hering-Breuer reflex is:

A)An inspiratory inhibitory reflex.
B)Stimulated by lung deflation.
C)Mediated by the phrenic nerve.
D)Activated by low Po₂.

Question 9

Central apnea is characterized by:

A)Vigorous chest wall and abdominal muscle activity.
B)Cessation of airflow at the nose.
C)Snoring.
D)Severe hypercarbia.

Question 10

Changes in partial pressure of oxygen (Po₂)are recognized/sensed by:

A)Central chemoreceptors.
B)Peripheral chemoreceptors.
C)Pulmonary mechanoreceptors.
D)The blood-brain barrier.