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Answer 1

Answer:

cardiac cycle:---> The cardiac cycle is the sequence of events that occurs when the heart beats. As the heart beats, it circulates blood through pulmonary and systemic circuits of the body. There are two phases of the cardiac cycle. In the diastole phase, the heart ventricles are relaxed and the heart fills with blood.                                                                                                                 heartbeat:- the pulsation of heart.  

antigen:-a toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.                                                antibody:-a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognizes as alien, such as bacteria, viruses, and foreign substances in the blood.                                                                                     if it helps mark as brainliest