Question

Please define all the terms all the terms
I will mark as brainliest whose definition will be best
Please answer
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Answer 1

1) a cardiac cycle is defined as the steps involving the conversion of deoxygenated blood to oxygeneted blood in the lungs.

2) heartbeat means one complete pulsation of the heart.

3) an antigen is any substance that causes your immune system to produce antibodies against it.

hope this helps you mate ✌️✌️❇️