Assertion A : In dializer the plasma proteins of the blood, cannot be filtered but molecules like urea, uric acid, creatinine and ions can be filtered
Reason R: The cellophane membrane used in dializer is permeable to macromolecules but impermeable to micromolecules

Options

A. Both A and R are true, R is correct explanation of A
B. Both A and R is true, R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer

To analyze the given assertion and reason, we will break down the statements and evaluate their validity step by step.

### Step 1: Understand the Assertion
**Assertion (A):** In a dialyzer, the plasma proteins of the blood cannot be filtered, but molecules like urea, uric acid, creatinine, and ions can be filtered.

- **Explanation:** The dialyzer, also known as an artificial kidney, is designed to filter out waste products from the blood. Plasma proteins are large molecules that cannot pass through the membrane of the dialyzer, while smaller molecules such as urea, uric acid, creatinine, and various ions can pass through and be removed from the blood.

### Step 2: Understand the Reason
**Reason (R):** The cellophane membrane used in the dialyzer is permeable to macromolecules but impermeable to micromolecules.

- **Explanation:** This statement is incorrect. The cellophane membrane is actually permeable to micromolecules (small molecules) and impermeable to macromolecules (large molecules). This allows for the filtration of waste products while retaining larger proteins in the blood.

### Step 3: Evaluate the Truth of Each Statement
- **Assertion (A):** True. Plasma proteins cannot be filtered, while smaller waste molecules can be filtered.
- **Reason (R):** False. The cellophane membrane is permeable to micromolecules, not macromolecules.

### Step 4: Conclusion
Since the assertion is true and the reason is false, the correct relationship between the two statements is that the assertion is correct while the reason is incorrect.

### Final Answer
The correct option is: Assertion is true, Reason is false.

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