ANF is secreted by :-

Options

A. Atrial wall and increase blood pressure
B. Atrial wall and decrease blood pressure
C. Ventrical wall and decrease blood pressure
D. Both atrial and ventricular wall to decrease blood pressure

Answer

To solve the question "ANF is secreted by:", we can follow these steps:

### Step 1: Understand what ANF is
ANF stands for Atrial Natriuretic Factor (or Atrial Natriuretic Peptide). It is a hormone that plays a crucial role in regulating blood pressure and fluid balance in the body.

**Hint:** Remember that ANF is related to the heart and its function in blood pressure regulation.

### Step 2: Identify the source of ANF
ANF is secreted by the atrial walls of the heart. Specifically, it is released from the atria (the upper chambers of the heart) when there is an increase in blood pressure.

**Hint:** Focus on the structure of the heart and where the atria are located.

### Step 3: Understand the function of ANF
The primary function of ANF is to lower blood pressure. It does this by promoting vasodilation (widening of blood vessels) and increasing the excretion of sodium and water by the kidneys, which helps to reduce blood volume and, consequently, blood pressure.

**Hint:** Consider how hormones can influence blood pressure and fluid balance in the body.

### Step 4: Analyze the options given
The options provided are:
1. Atrial wall and increases blood pressure
2. Atrial wall and decreases blood pressure
3. Ventricle wall and decreases blood pressure
4. Both atrial and ventricular wall decreases blood pressure

From our understanding, ANF is secreted by the atrial wall and its primary role is to decrease blood pressure.

**Hint:** Eliminate options that contradict the known function of ANF.

### Step 5: Choose the correct answer
Based on the analysis, the correct answer is:
**Option 2: Atrial wall and decreases blood pressure.**

**Final Answer:** ANF is secreted by the atrial wall and decreases blood pressure.