When kidney of a person is damaged, the patient suffers from anaemia because

Options

A. RBCs pass through the glomerulus
B. Sufficient erythropoietin is not produced
C. Haemoglobin is not synthesised efficiently
D. Iron and `B_(12)` vitamin are not able to bind to haemoglobin.

Answer

### Step-by-Step Solution:

1. **Understanding the Role of the Kidneys**: The kidneys are vital organs that perform several functions, including the regulation of blood pressure, electrolyte balance, and the production of hormones such as erythropoietin.

2. **Erythropoietin Production**: Erythropoietin is a glycoprotein hormone produced by the juxtaglomerular cells of the kidneys. Its primary role is to stimulate the production of red blood cells (RBCs) in the bone marrow.

3. **Impact of Kidney Damage**: When the kidneys are damaged, their ability to produce erythropoietin is compromised. This leads to a decrease in the levels of this hormone in the bloodstream.

4. **Consequences of Low Erythropoietin Levels**: With insufficient erythropoietin, the bone marrow does not receive the necessary signals to produce an adequate number of red blood cells. This results in a lower RBC count.

5. **Resulting Condition - Anemia**: A reduced number of red blood cells leads to anemia, a condition characterized by fatigue, weakness, and a decreased ability of the blood to carry oxygen to tissues.

6. **Conclusion**: Therefore, the primary reason a patient with kidney damage suffers from anemia is that sufficient erythropoietin is not produced.

### Final Answer:
The patient suffers from anemia because sufficient erythropoietin is not produced.

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