Read the following statements and choose the correct option
(i) Glomerular filtration rate in a healthy individual is about 180 ml/day
(ii) All constituents of plasma pass into lumen of Bowman's capsule
(iii) `70 - 80%` of electrolystes and water are absorbed in PCT
(iv) Angiotensin II increases the glomerular blood pressure and GFR
(v) Counter current system contribute in concentrating the filtrate

Options

A. i and ii only are correct
B. v along is correct
C. ii, iii and iv are correct
D. iii, iv and v are correct

Answer

To solve the question, we need to evaluate each statement regarding the excretory system and determine which ones are correct.

### Step-by-Step Solution:

1. **Evaluate Statement (i)**:
- The statement claims that the glomerular filtration rate (GFR) in a healthy individual is about 180 ml/day.
- **Correction**: The GFR is approximately 125 ml/minute, which translates to about 180 liters/day (not ml). However, this value is misleading as it refers to the total filtrate produced, not the urine excreted.
- **Conclusion**: This statement is incorrect.

2. **Evaluate Statement (ii)**:
- The statement claims that all constituents of plasma pass into the lumen of Bowman's capsule.
- **Correction**: Not all constituents pass through; larger molecules like proteins do not filter through the glomerulus. Glucose is also reabsorbed actively after filtration.
- **Conclusion**: This statement is incorrect.

3. **Evaluate Statement (iii)**:
- The statement claims that 70-80% of electrolytes and water are absorbed in the proximal convoluted tubule (PCT).
- **Correction**: This is a true statement. The PCT is responsible for the reabsorption of a significant portion of water and electrolytes.
- **Conclusion**: This statement is correct.

4. **Evaluate Statement (iv)**:
- The statement claims that angiotensin II increases glomerular blood pressure and GFR.
- **Correction**: Angiotensin II is a potent vasoconstrictor that helps to increase blood pressure, which can indirectly help maintain GFR.
- **Conclusion**: This statement is correct.

5. **Evaluate Statement (v)**:
- The statement claims that the counter-current system contributes to concentrating the filtrate.
- **Correction**: The counter-current mechanism in the loop of Henle does indeed help in concentrating urine by creating a gradient that facilitates water reabsorption.
- **Conclusion**: This statement is correct.

### Final Evaluation:
- Statements (iii), (iv), and (v) are correct.
- Therefore, the correct option is the one that includes statements 3, 4, and 5.

### Answer:
The correct option is **4** (statements 3, 4, and 5 are correct).