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Read the following statement and choose ...

Read the following statement and choose the correct option.
A. The first heart sound (lub) is associated with the closure of both semilunar valves.
The duration between the adjacent second heart sound and first heart sound is 0.3 seconds
C. The cardiac output is the stroke volume multiplied by the number of heartbeats per minute.

A

A, B and c are correct

B

A,C are correct but B is incorrect

C

A is correct but B, C are incorrect

D

A,B are incorrect but C is correct

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze each statement provided and determine which one is correct. ### Step 1: Analyze Statement A **Statement A:** The first heart sound (lub) is associated with the closure of both semilunar valves. - **Explanation:** The first heart sound (lub) is actually associated with the closure of the atrioventricular (AV) valves, which include the tricuspid and bicuspid (mitral) valves. The closure of the semilunar valves is associated with the second heart sound (dub). Therefore, this statement is **incorrect**. ### Step 2: Analyze Statement B **Statement B:** The duration between the adjacent second heart sound and first heart sound is 0.3 seconds. - **Explanation:** The duration between the first heart sound and the second heart sound is typically around 0.2 to 0.3 seconds, but in the context of heart sounds, it is more accurate to say that the duration is in milliseconds (approximately 20-30 milliseconds). Hence, this statement is also **incorrect**. ### Step 3: Analyze Statement C **Statement C:** The cardiac output is the stroke volume multiplied by the number of heartbeats per minute. - **Explanation:** This statement is correct. Cardiac output (CO) is defined as the amount of blood the heart pumps in one minute, and it is calculated using the formula: \[ \text{Cardiac Output (CO)} = \text{Stroke Volume (SV)} \times \text{Heart Rate (HR)} \] In a healthy adult, the stroke volume is approximately 70 mL, and with a heart rate of about 72 beats per minute, the cardiac output would be around 5 liters per minute. Therefore, this statement is **correct**. ### Conclusion After analyzing all three statements: - Statement A is incorrect. - Statement B is incorrect. - Statement C is correct. Thus, the correct option is **C**. ---
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