Question

The blood leaving the tissues becomes richer in

• A. Carbon dioxide
• B. Water
• C. Hemoglobin
• D. Oxygen

Answer 1

The correct option is A

Carbon dioxide

The correct option is option A:

Explanation of the correct option:

1. Blood is a fluid connective tissue.
2. It helps in the transportation of both carbon dioxide and oxygen.
3. It transports oxygenated blood to the tissues and the blood leaving the tissues is then rich in carbon dioxide.
4. This oxygen-depleted blood or carbon dioxide rich blood is transported to the lungs for the process of oxygenation.

Explanation for the incorrect options:

Option B:

1. Sodium ions are important and they help in maintaining the osmoregulation of the body.
2. When sodium is retained, water is retained in the body.
3. This retention results in higher plasma concentration and, as a result, increased blood volume.

Option C:

1. Hemoglobin is an iron-containing protein that transports oxygen to the tissues in the blood of many animals in the red blood cells (erythrocytes) of vertebrates.
2. Hemoglobin combines with oxygen and forms oxyhemoglobin.

Option D:

The blood which leaves the lungs is oxygen-rich blood and the blood which leaves the tissues is oxygen-depleted blood.

Final answer: The blood leaving the tissues becomes richer in carbon dioxide.