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The volume of blood present in each vent...

The volume of blood present in each ventricle before the beginning of atrial systole and at the end of joint diastole is.

A

21mL

B

70mL

C

49mL

D

99mL

Text Solution

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The correct Answer is:
To solve the question regarding the volume of blood present in each ventricle before the beginning of atrial systole and at the end of joint diastole, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Terms**: - **Systole** refers to the contraction phase of the heart, where the heart chambers (atria or ventricles) contract to pump blood out. - **Diastole** refers to the relaxation phase of the heart, where the heart chambers fill with blood. 2. **Identify the Context**: - The question asks for the volume of blood in the ventricles at two specific points: - Before the beginning of atrial systole (the contraction of the atria). - At the end of joint diastole (when both atria and ventricles are relaxed). 3. **Consider the Phases of the Cardiac Cycle**: - At the end of joint diastole, the ventricles are filled with blood from the atria. This is the point just before the atria contract to push more blood into the ventricles. - The volume of blood in the ventricles at this stage is known as the **end-diastolic volume (EDV)**. 4. **Determine the Volume**: - The typical end-diastolic volume for each ventricle is approximately 99 ml. This is the volume present in each ventricle before the atrial systole begins. 5. **Conclusion**: - Therefore, the volume of blood present in each ventricle before the beginning of atrial systole and at the end of joint diastole is **99 ml**. ### Final Answer: The correct answer is **99 ml**.
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