In the kidney , the formation of urine involve the following processes arranged as
(a) Glomerular filtration, reabsorption, and tubular secretion
(b) Reabsorption, filtration, and secretion
(c) Secretion, absorption, and filtration
(d) Filtration, secretion, and reabsorption

Options

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

Answer

To solve the question regarding the processes involved in the formation of urine in the kidney, we can break it down step by step:

### Step-by-Step Solution:

1. **Understanding the Processes**:
- The formation of urine in the kidneys involves three main processes: glomerular filtration, reabsorption, and tubular secretion.

2. **Identifying the First Process**:
- The first step in urine formation is **glomerular filtration**. This occurs in the glomerulus, where blood is filtered to produce glomerular filtrate. This filtrate contains water, electrolytes, and small molecules but excludes cells and proteins.

3. **Identifying the Second Process**:
- The second step is **reabsorption** (also known as tubular reabsorption). In this step, essential substances such as water, electrolytes, and nutrients are reabsorbed back into the bloodstream from the filtrate, ensuring that the body retains what it needs.

4. **Identifying the Third Process**:
- The final step is **tubular secretion**. In this process, waste products and excess ions that the body does not need are secreted from the blood into the filtrate, allowing for their elimination in urine.

5. **Arranging the Processes**:
- Based on the above understanding, the correct order of these processes is:
1. Glomerular filtration
2. Reabsorption
3. Tubular secretion

6. **Choosing the Correct Option**:
- Given the options:
(a) Glomerular filtration, reabsorption, and tubular secretion
(b) Reabsorption, filtration, and secretion
(c) Secretion, absorption, and filtration
(d) Filtration, secretion, and reabsorption
- The correct answer is **(a) Glomerular filtration, reabsorption, and tubular secretion**.

### Final Answer:
The correct arrangement of processes involved in the formation of urine in the kidney is **(a) Glomerular filtration, reabsorption, and tubular secretion**.