BP in systemic aorta is maximum during

Options

A. diastole of right ventricle
B. systole of left ventricle
C. diastole of right atrium
D. systole of left atrium

Answer

To determine when the blood pressure (BP) in the systemic aorta is maximum, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Heart**: The heart has four chambers: the right atrium, right ventricle, left atrium, and left ventricle. The left ventricle is responsible for pumping oxygenated blood into the systemic circulation via the aorta.

2. **Identify the Function of the Left Ventricle**: The left ventricle contracts during a phase known as systole. This contraction pushes blood into the aorta, which is the main artery supplying blood to the body.

3. **Recognize the Phases of the Cardiac Cycle**: The cardiac cycle consists of two main phases: systole (when the heart contracts) and diastole (when the heart relaxes). During systole, the pressure in the arteries, including the aorta, increases significantly as blood is ejected from the heart.

4. **Determine When BP is Maximum**: The blood pressure in the aorta reaches its peak during the systole of the left ventricle. This is because the forceful contraction of the left ventricle generates the highest pressure as blood is pushed into the aorta.

5. **Evaluate the Options**:
- Option A: Diastole of right ventricle - Not correct, as this phase does not involve the left ventricle.
- Option B: Systole of left ventricle - Correct, as this is when the maximum pressure occurs.
- Option C: Diastole of right atrium - Not correct, as this phase does not contribute to aortic pressure.
- Option D: Systole of left atrium - Not correct, as this phase does not directly impact the aorta.

6. **Conclusion**: Based on the understanding of the cardiac cycle and the function of the left ventricle, we conclude that the blood pressure in the systemic aorta is maximum during the systole of the left ventricle.

### Final Answer:
**The blood pressure in the systemic aorta is maximum during the systole of the left ventricle (Option B).**

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