Alveoli are tiny, balloon-shaped air sacs that sit at the very end of the respiratory tree, branching off the _______.

1. tertiary bronchi	2. bronchioles
3. terminal bronchioles	4. respiratory bronchioles

The basic rhythm of breathing is controlled by:
1. peripheral chemoreceptors
2. dorsal respiratory group of the medullary rhythmicity center
3. ventral respiratory group of the medullary rhythmicity center
4. pneumotaxic area

The opening between the vocal folds is called:

An important region of the body located between the lungs, where structures like the heart lie, is known as:

The pulmonary function of a person reveals the following values:
a. tidal volume = 500 mL
b. residual volume = 1000 mL
c. inspiratory reserve volume = 2500 mL
d. expiratory reserve volume = 1000 mL
His vital capacity is

The middle ear cavity is connected to the nasopharynx by:

The most negative pressure at the end of normal inspiration would be:

The volume of air that is available for gas exchange each minute is the
1. minute ventilation
2. anatomical dead air space
3. physiological dead air space
4. alveolar ventilation

The respiratory system does not:
1. allow oxygen from the air to enter the blood and carbon dioxide to leave the blood and enter the air.
2. alter the pH by changing oxygen levels.
3. provide protection against some microorganisms by preventing their entry into the body and by removing them from respiratory surfaces.
4. allow for speech and sound generation.

The dorsal respiratory group of the respiratory center in the brain stem stimulates: