The nurse is assessing a client who has dyspnea and considering the process of gas exchange. Which structural characteristic of capillaries best enables gas exchange at the cellular level?
A) Capillaries are one cell–layer thick.
B) Capillaries form a complex network.
C) Capillaries transport blood back to the heart.
D) Capillaries are elastic structures.
A
Feedback:
Capillaries are one cell–layer thick and in direct contact with the cells of all tissues. This allows easy of gas exchange. Capillaries do form a complex network; however, it is the one cell structure that facilitates gas exchange. Venules and veins transport blood back to the heart. Arteries are elastic.
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