Which of the following statements are correct?
(i). Renal vein takes blood away from kidney.
(ii). Urine gets diluted in ascending limb of loop of Henle.
(iii). Podocyte occur in inner wall of Bowman's capsule.
(iv). Ultrafiltrate/nephric filtrate is plasma minus proteins.

Options

A. (i) and (ii)
B. (i) and (iii)
C. (iii) and (iv)
D. (i),(ii),(iii) and (iv)

Answer

To determine which statements are correct regarding the excretory system, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i): Renal vein takes blood away from the kidney.**
- The renal vein does indeed take deoxygenated blood away from the kidney. It drains blood into the inferior vena cava. Therefore, this statement is **correct**.

2. **Statement (ii): Urine gets diluted in the ascending limb of the loop of Henle.**
- The ascending limb of the loop of Henle is impermeable to water, which means that as ions (like sodium and chloride) are reabsorbed, the filtrate becomes hypotonic (diluted) compared to the plasma. Thus, this statement is also **correct**.

3. **Statement (iii): Podocytes occur in the inner wall of Bowman's capsule.**
- Podocytes are specialized cells that form the inner layer of the Bowman's capsule and have filtration slits that allow for the passage of certain substances while retaining larger molecules like proteins. Therefore, this statement is **correct**.

4. **Statement (iv): Ultrafiltrate/nephric filtrate is plasma minus proteins.**
- Ultrafiltrate refers to the fluid that is filtered from the blood in the glomerulus, which is indeed plasma minus larger proteins and cells. This statement is also **correct**.

### Conclusion:
All four statements are correct. Thus, the correct answer is option **D: 1, 2, 3, and 4 are correct statements**.

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