Question

which of the following is true about external respiration? it includes the act of taking in air as the diaphragm contracts. it includes the act of breathing out as the diaphragm relaxes. it includes the movement of gases in the alveolar capillaries. it includes the movement of gases in the tissue capillaries.

Explanation:

External respiration involves the exchange of gases between the alveoli in the lungs and the blood in the alveolar capillaries. Inhalation occurs as the diaphragm contracts and air is taken in, and exhalation occurs as the diaphragm relaxes and air is breathed out. The movement of gases in the tissue capillaries is part of internal respiration.

Answer:

It includes the act of taking in air as the diaphragm contracts.
It includes the act of breathing out as the diaphragm relaxes.
It includes the movement of gases in the alveolar capillaries.