Control of Breathing Practice Questions

Question 1

Peripheral and central chemoreceptors may both contribute to the increased ventilation that occurs as a result of which of the following?

Accepted Answer

An increase in arterial carbon dioxide tension

Answer

A decrease in arterial oxygen content

Answer

A decrease in arterial blood pressure

Answer

A decrease in arterial oxygen tension

Question 2

What physiological mechanism is responsible for the increase in the duration of expiration?

Accepted Answer

Hering-Breuer reflex

Answer

J-reflex

Answer

Head's paradoxical reflex

Answer

Proprioceptors

Question 3

All of the following statements about acid-base disorders are true, EXCEPT:

Accepted Answer

Metabolic acidosis is compensated by increasing Pco2

Answer

Buffering may be intra & extra cellular

Answer

pH determined by Pco2 and HCO3

Answer

Respiratory acidosis is compensated by HCO3

Question 4

Which of the following statements about the Hering-Breuer inflation reflex is false?

Accepted Answer

Protects against underinflation of the lungs.

Answer

Is mediated by vagal afferents from pulmonary stretch receptors.

Answer

Involves stimulation of the inspiratory center.

Answer

Inhibits further inspiration when lung inflation is excessive.

Question 5

Which of the following structures in the central nervous system contains major autonomic reflex centers?

Accepted Answer

Medulla oblongata

Answer

Thalamus

Answer

Cerebellum

Answer

Hypothalamus

Question 6

Which of the following is the most important clinical principle regarding acute high-altitude pulmonary edema (HAPE)?

Accepted Answer

The primary treatment for HAPE is immediate descent to a lower altitude.

Answer

HAPE is more common at altitudes above 2500 meters but can occur at lower altitudes.

Answer

Elevated ESR is the most specific diagnostic marker for HAPE

Answer

HAPE only occurs at altitudes above 4000 meters

Question 7

Which physiological adaptation does not happen at high altitudes?

Accepted Answer

Respiratory acidosis

Answer

Pulmonary vasoconstriction

Answer

Hypoxia

Answer

Polycythemia

Question 8

Damage to pneumotaxic center along with vagus nerve causes which type of respiration?

Accepted Answer

Apneustic breathing

Answer

Cheyne-Stokes breathing

Answer

Deep and slow breathing

Answer

Shallow and rapid breathing

Question 9

Which of the following statements about breathing is incorrect?

Accepted Answer

Normal breathing occurs when transpulmonary pressure is 5-8 cm H2O

Answer

Inspiration is an active process

Answer

Expiration during quiet breathing is passive

Answer

Compliance is influenced by multiple factors including surfactant.

Question 10

Curare notch seen in capnograph is due to

Accepted Answer

Spontaneous breathing

Answer

Carbon dioxide rebreathing

Answer

Valve malfunction

Answer

Bronchospasm

Control of Breathing — MCQs

Control of Breathing — MCQs

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