The blood leaving the tissues becomes richer in
(A) carbon dioxide
(B) water
(C) hemoglobin
(D) oxygen
Answer
When the cells undergo respiration , they take in oxygen from the blood and release carbon dioxide.
- This CO 2 is carried in the blood by the capillaries and veins back to the heart for re-oxygenation .
- Thus, the blood that leaves the tissues is rich in carbon dioxide .
So, the correct answer is (a) carbon dioxide