Respiratory System Worksheet Questions

An increase in the partial pressure of CO2 causes bronchioles to

• constrict.

• dilate.

The chest wall is anatomically configured to contract inwardly, so that when the thorax is opened surgically its walls collapse.

• True

• False

What prevents the trachea from collapsing?

• The internal air pressure within the trachea

• The C-shaped cartilaginous rings

Which is not part of the conducting portion of the respiratory system?

• Trachea

• Alveoli

In general, respiratory zone structures are lined with a thicker mucosa than conducting zone structures.

• True

• False

Olfactory receptors located in the superior region of the nasal cavity are stimulated when airborne molecules are inhaled and dissolved in the mucous covering.

• True

• False

Which is not a function of the respiratory system?

• Gas exchange

• Sound reception

• Odor detection

• Air passage

Approximately what percent of the oxygen in blood is transported by the hemoglobin of erythrocytes?

• 50%

• 66%

• 33%

• 75%

• 98%

Compared to its partial pressure at sea level, what would be the partial pressure of oxygen at an altitude with an atmospheric pressure of only 380 mmHg (recall that sea level atmospheric pressure is 760 mmHg)?

• Po2 would be three-quarters as much as it would be at sea level.

• Po2 would be twice as much as it would be at sea level.

• Po2 would be one-fourth as much as it would be at sea level.

• Po2 would be half as much as it would be at sea level.

Alveoli abut each other, causing them to appear ______ in cross section.

• stratified

• enlarged

• columnar

• polygonal

• Circular