Cardiac Cycle Overview

The natural pacemaker of the heart that initiates electrical signals.

The sequence of events in one heartbeat, including diastole and systole.

The phase when ventricles are relaxed and fill with blood.

The phase when ventricles contract to pump blood out.

A phase where atria contract to push blood into ventricles.

The period when ventricles relax but no blood enters or leaves.

Difference in blood pressure that drives blood flow.

The ordered events of contraction and relaxation governing blood flow.

The volume of blood in the left ventricle at the end of diastole before contraction.

The sound produced by the closure of the AV valves during ventricular contraction.

The sound created by the closure of the semilunar valves at the end of ventricular systole.

The act of listening to heart sounds using a stethoscope to assess heart health.

The volume of blood remaining in the left ventricle after contraction.

A graphical representation of pressure and volume throughout the cardiac cycle.

The total volume of blood in the ventricle before contraction at the end of diastole.

The volume of blood remaining in the ventricle after contraction at the end of systole.

Phase where ventricular muscles contract without changing volume, building pressure.

Phase of cardiac cycle where blood is expelled from the ventricles into the arteries.

The amount of blood pumped by the heart with each contraction.

Period when the heart relaxes but there's no change in volume as the valves are closed.

The process where ventricles fill with blood during diastole.

Increase in pressure during isovolumetric contraction as the ventricles prepare to eject blood.

Represents the filling of the ventricle (EDV) in the pressure-volume loop.

Represents the blood ejection phase where the heart pumps blood out.

The pressure generated by the ventricles during contraction and relaxation.

The amount of blood present in the ventricles at any given time.

Correlations between pressure and volume that illustrate heart mechanics.

The sequence of events involving filling and emptying of the heart.

The phase of the cardiac cycle where ventricles contract without change in volume, closing AV valves without opening semilunar valves.

The phase where ventricular pressure exceeds arterial pressure, opening semilunar valves to eject blood.

Valves located at the exit of each ventricle, prevent backflow into the heart after blood is ejected.

A small dip in the aortic pressure curve following the closure of the semilunar valves.

The phase when the ventricles relax and fill with blood from the atria.

The electrical impulse on an ECG that corresponds to ventricular depolarization and contraction.

The volume of blood present in the left ventricle at any given time during the cardiac cycle.

The phase when the atria are relaxed and filling with blood from the veins.

S1 indicates closure of AV valves at the beginning of ventricular systole, while S2 signals closure of semilunar valves at the beginning of diastole.

A graphical representation of the cardiac cycle illustrating pressures and volumes in the heart.

The initial phase of ventricular relaxation where the ventricles begin filling with blood.