Cardiac output

Cardiac Output Definition: Cardiac output refers to the amount of blood pumped out of the heart per unit of time. It is calculated by multiplying the he...

Cardiac Output

Definition:

Cardiac output refers to the amount of blood pumped out of the heart per unit of time. It is calculated by multiplying the heart rate by the stroke volume.

Factors Affecting Cardiac Output:

Heart rate: The number of heartbeats per unit of time. A higher heart rate will result in a higher cardiac output. For example, when a person is exercising, their heart rate can increase to meet the increased demand for oxygen and nutrients.
Stroke volume: The amount of blood pumped out of the heart with each heartbeat. A higher stroke volume will result in a higher cardiac output. For example, when a person has a larger heart, they can pump more blood with each heartbeat.
Blood viscosity: The resistance of blood to flow. A more viscous blood will require more force to pump, resulting in a lower cardiac output.
Blood pressure: The force of blood against the walls of the blood vessels. A higher blood pressure will require more force to pump blood, resulting in a lower cardiac output.
Age: The heart is more efficient at pumping blood when it is younger.

Importance of Cardiac Output:

Oxygenation: Cardiac output is a major factor in the body's ability to meet the oxygen and nutrient demands of cells.
Waste removal: Cardiac output helps to remove waste products from the body.
Blood pressure regulation: Cardiac output helps to maintain blood pressure within a normal range.
Cardiovascular health: A healthy cardiac output is essential for overall cardiovascular health.

Example:

A person with a heart rate of 120 beats per minute and a stroke volume of 10 liters per heartbeat has a cardiac output of 1200 liters per minute