Question
The image below represents
| A. |
Rapid filling phase
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| B. |
Rapid ejection phase
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| C. |
Isovolumic relaxation
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| D. |
Isovolumic contraction
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Show Answer
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Correct Answer � B
Explanation
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Answer- B
Due to the opening of semilunar valves and isotonic contraction of ventricles, blood is ejected out of both the ventricles. Hence, this period is called ejection period. Duration of this period is 0.22 second. Ejection period is of two stages:
- First Stage or Rapid Ejection Period First stage starts immediately after the opening of semilunar valves. During this stage, a large amount of blood is rapidly ejected from both the ventricles. It lasts for 0.13 second.
- Second Stage or Slow Ejection Period During this stage, the blood is ejected slowly with much less force. Duration of this period is 0.09 second
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