Question

bio - 202 topic 4: respiratory system physiology
practice it
what is the role of the diaphragm in breathing?
the diaphragm is responsible for filtering the air during inhalation.
the diaphragm is a bone in the chest that helps protect the heart.
the diaphragm is used for speech production.
the diaphragm contracts and flattens during inhalation, increasing the volume of the chest cavity and drawing air into the lungs. the diaphragm relaxes during exhalation, decreasing the volume of the chest cavity and pushing air out of the lungs.
the diaphragm helps the body digest food.

Explanation:

The diaphragm is a muscle. During inhalation, it contracts and flattens, increasing the chest cavity volume to draw air into the lungs. During exhalation, it relaxes, decreasing the chest cavity volume to push air out. Filtering air is mainly done by nasal passages, etc. The diaphragm is not a bone (ribs protect the heart). Speech production involves vocal cords, etc. Digestion is mainly by digestive organs like the stomach and intestines.

Answer:

The diaphragm contracts and flattens during inhalation, increasing the volume of the chest cavity and drawing air into the lungs. The diaphragm relaxes during exhalation, decreasing the volume of the chest cavity and pushing air out of the lungs.