In the kidney , the formation of urine involve the following processes arranged as

Options

A. Glomerular filtration, reabsorption and tubular secretion
B. Reabsorption, filtration and secretion
C. Secretion, absorption and filtration
D. Filtration ,secreton and reabsorption

Answer

**Step-by-Step Solution:**

1. **Understanding the Nephron Structure**: The nephron is the basic structural and functional unit of the kidney. It consists of two main parts: the renal corpuscle and the renal tubule.

2. **Renal Corpuscle**: The renal corpuscle is made up of the Bowman's capsule and the glomerulus. This is where the first step of urine formation occurs.

3. **Glomerular Filtration**: The first process in urine formation is glomerular filtration. Blood enters the glomerulus, where it is filtered, and the filtrate collects in the Bowman's capsule.

4. **Renal Tubule**: After glomerular filtration, the filtrate moves into the renal tubule, which consists of the proximal convoluted tubule (PCT), the loop of Henle, and the distal convoluted tubule (DCT).

5. **Reabsorption**: The second process is reabsorption, which primarily occurs in the proximal convoluted tubule (PCT). Here, essential substances such as water, electrolytes, and nutrients are reabsorbed back into the bloodstream.

6. **Tubular Secretion**: The final process is tubular secretion, which occurs mainly in the distal convoluted tubule (DCT). During this step, additional substances like potassium, sodium, and hydrogen ions are secreted into the filtrate.

7. **Conclusion**: The correct order of processes involved in urine formation in the kidney is:
- Glomerular filtration
- Reabsorption
- Tubular secretion

**Final Answer**: The correct arrangement of processes involved in urine formation in the kidney is: **Glomerular filtration, Reabsorption, Tubular secretion**.

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