Fall of GFR activate JG cells to release renin which converts
angiotensinogen into____.
Angiotensinogen-II is a powerfull_____.
Causes increase in glomerular blood pressure.
Causes increase in_____.

Answer

To solve the question step by step, we will break down each part of the question and provide the answers accordingly.

### Step 1: Understanding the Role of GFR
- GFR stands for Glomerular Filtration Rate, which is a measure of how well the kidneys are filtering blood. A fall in GFR indicates that the kidneys are not filtering blood effectively.

### Step 2: Activation of JG Cells
- The fall in GFR activates the juxtaglomerular (JG) cells in the kidneys. These cells respond to low blood pressure or low sodium levels by releasing an enzyme called renin.

### Step 3: Conversion of Angiotensinogen
- Renin acts on a protein called angiotensinogen, which is produced by the liver. Renin converts angiotensinogen into angiotensin I.
- **Answer:** Angiotensinogen is converted into **angiotensin I**.

### Step 4: Formation of Angiotensin II
- Angiotensin I is then converted into angiotensin II by the action of an enzyme called angiotensin-converting enzyme (ACE), primarily in the lungs.

### Step 5: Function of Angiotensin II
- Angiotensin II is a powerful vasoconstrictor. This means it causes blood vessels to constrict, which increases blood pressure.
- **Answer:** Angiotensin II is a powerful **vasoconstrictor**.

### Step 6: Effects on Glomerular Blood Pressure
- The increase in blood pressure due to vasoconstriction leads to an increase in glomerular blood pressure, which helps to restore GFR.
- **Answer:** It causes an increase in **glomerular filtration rate (GFR)**.

### Final Answers:
1. Angiotensinogen is converted into **angiotensin I**.
2. Angiotensin II is a powerful **vasoconstrictor**.
3. It causes an increase in **glomerular filtration rate (GFR)**.

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