IAL Edexcel Biology - Cardiac Cycle
Topic 1 Molecules Transport and Health
1.8 Know the cardiac cycle (atrial systole, ventricular systole and cardiac diastole) and relate the structure and operation of the mammalian heart, including the major blood vessels, to its function
The mammalian heart
👇 You may wish to revise the heart anatomy for IAL Edexcel Biology 👇
The cardiac cycle
Important point to note for IAL Biology
Valves open and close as a result of pressure differences (pressure gradients), but NOT because of muscles in the valves contracting.
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And now you know why our heart goes "lub-dub" when we get nervous ;)
Written by Vivian | GCE Biology Specialist @ TUTTEE
1. Edexcel AS Biology Revision Guide. Edexcel.
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