Blood leaving the tissues become richer in a component. Name the component.

Explanation:

Carbon-dioxide

1. Blood transports various essential components to the body cells like glucose, oxygen and many other nutrients.
2. It conveys nutrients from the digestive tract and accumulation sites to the rest of the body.
3. The blood leaves the tissues of the body and becomes rich in carbon dioxide.
4. Oxygenated blood is transported from the heart to the lungs by the main artery (aorta).
5. Blood when reaches the tissues it gives oxygen to the cells of the tissues.
6. Whereas it receives carbon-dioxide from the cells.
7. Therefore, carbon-dioxide concentration increases in the blood leaving the tissues.