Question

the respiratory system mastery test
4
select the correct answer
which step is a part of internal respiration?
a. oxygen - rich blood is taken up by the tissues.
b. air is inhaled through the nostrils.
c. air is exhaled through the nostrils.
d. gaseous exchange of oxygen and carbon dioxide occurs at the alveoli.
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Explanation:

Internal respiration involves the exchange of gases between the blood and the body's tissues. Oxygen - rich blood is delivered to the tissues, and carbon - dioxide from the tissues enters the blood. Options B and C are parts of external respiration (breathing), and option D is gas exchange in the lungs (pulmonary gas exchange), which is also part of external respiration.

Answer:

A. Oxygen - rich blood is taken up by the tissues