Cardiac Cycle

Cardiac Cycle – Heart

Required reading

The following web article describes the phase of the cardiac cycle.


Cardiac Output

Cardiac output is how much blood is pumped by the heart by the right and left ventricle per minute. Cardiac outflow is directly related to the quantity of blood pumped to various parts of the body to meet the demands for maintainest and tissue perfusion.

If the heart rate becomes too slow or too fast cardiac out will drop and not be able to maintain adequate perfusion.

If the heart is damaged or can not function properly;y the cardiac output is affected and in turn, so is the quantity of blood that can be pumped to the lungs and the body.

Cardiac output is calculated by the following equation.

Cardiac out put= stroke volume x heart rate


CO – ml per minute (ml/min)
SV – ml or l
HR – Beats per Minute (bpm)

Stroke volume is the amount of blood pumped out of each ventricle when the heartbeats.

Heart rate is the number of times the heart beats in a minute.


Learn How the Heart Beats in the Phases of the Cardiac Cycle. (2019, November 11). ThoughtCo.

Byte Size Med. (2022, August 3). Cardiac Cycle | Events | Part 1 | Cardiac Physiology. YouTube.

Hasudungan, A. (2018, June 19). Cardiovascular System Physiology – Cardiac Output (stroke volume, heart rate, preload and afterload). YouTube.