How does an output from the circulatory system serve as an input to the respiratory system?

Question

Answer options with 4 options
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 1

The correct answer is:

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

This is because carbon dioxide, a waste product of cellular respiration, is transported in the blood from the body's tissues to the lungs, where it is exchanged for oxygen in the alveoli.