Where is Blood Oxygenated

Question

Where is blood oxygenated?
A) Within the left ventricle
B) Within the left anterior descending artery
C) Within the coronary sinus
D) Across the alveolus/pulmonary capillary membrane

Accepted Answer

Blood is oxygenated across the alveolus/pulmonary capillary membrane during respiration. Oxygen from inhaled air diffuses across the membrane into the capillary blood while carbon dioxide diffuses from the capillary blood into the alveoli to be exhaled.