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The Cardiac cycle

The Cardiac cycle. Can confidently label internal &amp; external photos of the heart Can describe the cardiac cycle Can explain how the heart valves help with the cardiac cycle. Bell Task. Label the heart diagram and complete the questions. Label the gaps. Answer these questions.

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Qu.1. How long is each heart beat?

Qu.1. How long is each heart beat?. 1 cardiac cycle lasts 0.75secs, so heart rate = 60/0.75 = 80 beats/min. 1. The AV valve closes at 1 because the pressure of blood in the ventricle is greater than in the atrium. Qu.2 Explain why the AV valve closes at 1?. 2.

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