b. levels of oxygen in the blood.
c. levels of carbon dioxide in the alveolar air space.
d. levels of carbon dioxide in the blood.
e. level of stretching of the rib muscles and diaphragm.
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Question 6
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Question text
Blood richest in oxygen is found in the
Select one:
a. inferior vena cava.
b. superior vena cava.
c. pulmonary arteries.
d. pulmonary veins.
e. systemic capillaries.