Assertion `:` Systolic pressure is higher then diastolic pressure.
Reason `:` Arteries contract during systole of heart.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion .
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are false.

Answer

**Step-by-Step Solution:**

1. **Understanding Systolic and Diastolic Pressure:**
- Systolic pressure is the pressure in the arteries when the heart beats and pumps blood. It is the maximum pressure exerted on the arterial walls.
- Diastolic pressure is the pressure in the arteries when the heart is at rest between beats. It is the minimum pressure exerted on the arterial walls.

2. **Comparison of Systolic and Diastolic Pressure:**
- It is a well-established fact that systolic pressure is higher than diastolic pressure. For example, a normal systolic pressure is approximately 120 mm Hg, while normal diastolic pressure is around 80 mm Hg.

3. **Understanding the Mechanism:**
- During the systole phase of the cardiac cycle, the heart contracts and pumps blood into the arteries. This contraction causes the arteries to expand and the pressure within them to rise, resulting in higher systolic pressure.
- Conversely, during diastole, the heart relaxes, and the pressure in the arteries decreases, leading to lower diastolic pressure.

4. **Evaluating the Assertion and Reason:**
- The assertion states that "systolic pressure is higher than diastolic pressure," which is true.
- The reason given is "arteries contract during systole of the heart." This statement is also true, as the contraction of the heart during systole causes the arteries to expand and increases the pressure.

5. **Conclusion:**
- Both the assertion and reason are true. Additionally, the reason correctly explains the assertion, as the contraction of the arteries during systole is what leads to the higher systolic pressure compared to diastolic pressure.

**Final Answer:**
Both the assertion and reason are true, and the reason is the correct explanation of the assertion.

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