Question

Ontract atrial systole

1. When the atria _contract______, called _atrial systole__________ (or atrial emptying), the
relax ventricular diastole
ventricles ___relax___, called __ventricular diastole_______________(or ventricular filling).
atrial diastole contract
2. When the atria relax, called _____atrial diastole_______, the ventricles _contract_______,
ventricular systole
called _ventricular systole 3. Then the atria and ventricles all relax briefly. This series of events is the
complete cardiac cycle or heartbeat.

Answer 1

The cardiac cycle involves atrial and ventricular contraction and relaxation. Atrial systole and ventricular diastole occur when the atria contract and the ventricles relax. On the other hand, atrial diastole and ventricular systole take place when the atria relax and the ventricles contract.

Step-by-step explanation:

The cardiac cycle consists of alternating periods of atrial and ventricular contraction and relaxation. When the atria contract, it is called atrial systole, while ventricular relaxation is known as ventricular diastole. Atrial diastole refers to the relaxation of the atria, during which the ventricles contract in ventricular systole. This sequence of events makes up the complete cardiac cycle or heartbeat.