Name

Event

Outcome

Valves

Pressure

Diastole

Heart muscle is relaxed

The atria fill with blood opening the atrioventricular (AV) valves and blood enters ventricles

Semilunar valves close

AV valves open

Low but slowly rises as blood enters

Low in arteries (diastolic pressure

Atrial Systole

Atrial muscle contracts

Blood pushed into ventricles

Atria are emptied

AV valves pushed fully open

Rises in both atria and ventricles as blood enters

Ventricular systole

Ventricular muscle contracts

Blood forced into the arteries

AV valves snap shut

Heart tendons hold valves into place

Semilunar valves pushed open as blood enters arteries

Valves pushed open when ventricular pressure is greater than arterial pressure

Atrial pressure falls

Ventricular Pressure rises steeply as muscle contracts

Continues to rise for 0.1 second but falls as empties

Artery pressure if high (systolic pressure)

	Creado por Jaeos hace más de 10 años

Includes the Heart. Lungs and Circulatory System F221 As Level OCR

The Circulatory System