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Assertion (A): Systolic pressure is high...

Assertion (A): Systolic pressure is higher than the diastolic pressure.
Reason (R): During diastole, cuspid valves open while during systole semilunar valves open.

A

Both A and Rare true and R is the cor- rect explanation for A.

B

Both A and R are true, but R is not the correct explanation for A.

C

A is true and R is false.

D

A is false and R is true.

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: The assertion states that "Systolic pressure is higher than the diastolic pressure." - **Explanation**: Systolic pressure occurs when the heart's ventricles contract and pump blood into the arteries, leading to a higher pressure reading. In contrast, diastolic pressure occurs when the heart is at rest between beats, resulting in a lower pressure reading. 2. **Understanding the Reason (R)**: The reason states that "During diastole, cuspid valves open while during systole semilunar valves open." - **Explanation**: During diastole, the heart's ventricles fill with blood, and the cuspid (atrioventricular) valves open to allow blood to flow from the atria to the ventricles. During systole, the ventricles contract, and the semilunar valves open to allow blood to flow from the ventricles into the arteries. 3. **Evaluating the Truth of Assertion and Reason**: - Both the assertion and the reason are true statements. Systolic pressure is indeed higher than diastolic pressure, and the described valve actions during diastole and systole are accurate. 4. **Determining the Relationship**: - The reason (R) provides a correct explanation for the assertion (A) because the higher systolic pressure is a direct result of the heart's contraction and the opening of the semilunar valves during systole. 5. **Selecting the Correct Option**: - Based on the evaluation, the correct option is that both assertion and reason are true, and the reason is the correct explanation of the assertion. ### Final Answer: The correct answer is: **Both assertion and reason are true, and reason is the correct explanation of assertion.**
### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: The assertion states that "Systolic pressure is higher than the diastolic pressure." - **Explanation**: Systolic pressure occurs when the heart's ventricles contract and pump blood into the arteries, leading to a higher pressure reading. In contrast, diastolic pressure occurs when the heart is at rest between beats, resulting in a lower pressure reading. 2. **Understanding the Reason (R)**: The reason states that "During diastole, cuspid valves open while during systole semilunar valves open." - **Explanation**: During diastole, the heart's ventricles fill with blood, and the cuspid (atrioventricular) valves open to allow blood to flow from the atria to the ventricles. During systole, the ventricles contract, and the semilunar valves open to allow blood to flow from the ventricles into the arteries. ...
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