Exam 11: The Respiratory System

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 a fall in atmospheric PO₂ on O₂ exchange within the lungs

Pulmonary surfactant decreases surface tension to a greater degree in large alveoli than in small alveoli.

What is the atmospheric PO₂?

O₂ is much more soluble in blood than CO₂ is.

Which statement regarding the apneustic centre is correct?

The alveolar wall is ____________________ [how many?] cell layer(s)thick.The wall of the pulmonary capillaries surrounding an alveolus is ____________________ cell [how many?] layer(s)thick.

Which statement concerning pulmonary surfactant is INCORRECT?

Approximately what percentage of carbon dioxide is transported in the blood in dissolved form?

Slow,deep breathing is more effective for increasing alveolar ventilation than is rapid,shallow breathing.

Which statement is correct for residual volume?

Administering O₂ to patients with severe chronic lung disease will not depress their drive to breathe.

Contraction of the ____________________ muscles elevates the ribs.

Which statement is NOT true when the chloride shift in red blood cells occurs?

At a constant temperature,the pressure that a gas exerts depends on the volume that it occupies.

If there is a deficient supply of pulmonary surfactant,the lungs become more compliant.

The primary factor that determines the percent Hb saturation is the ____________________.

Which statement concerning the peripheral chemoreceptors is INCORRECT?

____________________ refers to a collapsed lung.

What is the term for the entire sequence of events involved in the exchange of O₂ and CO₂ between the body cells and the environment?

Which statement concerning alveoli is INCORRECT?