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 .