the diagram represents blood vessels and alveoli (air sacs) in human lungs. how does an output from the…

the diagram represents blood vessels and alveoli (air sacs) in human lungs. how does an output from the circulatory system serve as an input to the respiratory system? a. oxygen from the veins moves into the alveoli. b. carbon dioxide from the veins moves into the alveoli. c. oxygen - rich blood moves from the veins into the alveoli. d. carbon dioxide - rich blood moves from the veins into the alveoli.

the diagram represents blood vessels and alveoli (air sacs) in human lungs. how does an output from the circulatory system serve as an input to the respiratory system? a. oxygen from the veins moves into the alveoli. b. carbon dioxide from the veins moves into the alveoli. c. oxygen - rich blood moves from the veins into the alveoli. d. carbon dioxide - rich blood moves from the veins into the alveoli.

Answer

Brief Explanations:

In the gas - exchange process in lungs, deoxygenated blood (carbon - dioxide rich) in veins brings carbon dioxide to the alveoli for exhalation. Oxygen diffuses from alveoli into the blood. Veins carry deoxygenated blood to the lungs.

Answer:

B. Carbon dioxide from the veins moves into the alveoli.