Exam 11: The Respiratory System

Pulmonary surfactant reduces the work of breathing and increases lung stability by increasing alveolar surface tension.

The quantity of air that will flow into and out of the lungs depends solely on the radius of the respiratory airways.

Arterial PO₂ remains normal or may even increase slightly during exercise despite the fact that O₂ consumption by the tissues is greatly increased.

The inspiratory and expiratory neurons both display pacemaker activity.

___________________ is normally the most important input in regulating the magnitude of ventilation under resting conditions.

Which factor would reduce the alveolar ventilation rate the most?

Pulmonary surfactant increases alveolar surface tension and does not affect lung expansion.

drop in the oxygen levels in arterial blood ____________________ the central chemoreceptors.

Indicate the effect the following changes would have on the rate of gas transfer by using the answer code (options may be used more than once or not at all): -the effect of reduced systemic venous PO₂ on O₂ exchange within the lungs

may occur when pulmonary surfactant secretion drops.

Which statement regarding haemoglobin is correct?

Which statement is correct when outward airflow has ceased at the end of a normal expiration?

Which circumstance causes intrapleural pressure to exceed airway pressure?

Which statement is correct for the intrapulmonary pressure?

All respiratory airways are held open by cartilaginous rings.

O₂ moves from the alveoli to the blood by active transport.

Which statement is correct concerning functional residual capacity?