Question

1. how does carbon dioxide leave the body?

Explanation:

Carbon dioxide is transported in the blood. Some is dissolved in plasma, some combines with hemoglobin to form carbamino - hemoglobin, and most reacts with water to form carbonic acid which then dissociates. In the lungs, carbon dioxide diffuses from the blood (where it is in higher concentration) into the alveoli (where it is in lower concentration) due to the concentration gradient. Then, during exhalation, the carbon dioxide - rich air is expelled from the lungs.

Answer:

Carbon dioxide leaves the body through the process of exhalation. In the lungs, carbon dioxide diffuses from the blood into the alveoli (due to a concentration gradient) and is then exhaled out of the body.