29/07 Lecture 8 - Cardiac Physiology I

Systole

This refers to the contraction of the heart, and rising pressure in the blood vessels

Diastole

This refers to relaxation of the heart, and falling pressure in blood vessels

Atrial systole

This stage has the AV valves open, where the atria contract to pump blood into the ventricles

Isovolumetric ventricular contraction

This stage has the semilunar and AV valves closed, where the ventricles begin to contract

Ventricular ejection

This stage has the semilunar valves pushed open, where blood is pumped from the ventricles

Isovolumetric ventricular relaxation

This stage has the semilunar and AV valves closed, as the cardiac pressure drops

Passive filling

This stage has the ventricles fill at low pressure as the AV valves open

Lubb sound

This occurs as the AV valves close before isovolumetric ventricular contraction

Dupp sound

This occurs as the semilunar valves close after ventricular ejection

Pulse pressure

This refers to the difference between the systolic and diastolic BP values

Hypertension

This refers to a period of high blood pressure

Hypotension

This refers to a period of low blood pressure