Question

With which of the following event the cardiac cycle starts?

Options

• Beginning of ventricular diastole

• Auricular systole

• Auricular diastole

• Ventricular systole

Answer 1

Auricular systole

Explanation:

Through the superior vena cava, inferior vena cava, and coronary sinus, deoxygenated blood enters the right atrium. Blood enters the right ventricle when the right atrium contracts. As a result, the cardiac cycle starts with auricular systole.