The Cardiac Cycle and Heart Sounds

Vocabulary flashcards covering the phases of the cardiac cycle (diastole and systole), valve states during blood flow, and the mechanisms behind heart sounds.

Diastole

The relaxation (filling) phase of the cardiac cycle.

Systole

The contraction phase of the cardiac cycle where contraction creates pressure, opening the exit doors (pulmonary and aortic valves).

Heart Sounds

Sounds made by the closure of heart valves, where one heartbeat consists of 'Lubb' and 'Dupp'.

Lubb

The systolic heart sound caused by the closure of the atrioventricular valves (mitral and tricuspid).

Dupp

The diastolic heart sound caused by the closure of the semilunar valves (aortic and pulmonic).

Atrioventricular Valves

The heart valves comprising the mitral and tricuspid valves, the closure of which causes the 'Lubb' heart sound.

Semilunar Valves

The heart valves comprising the aortic and pulmonic valves, the closure of which causes the 'Dupp' heart sound.

Diastole (Right Side)

Phase in which blood returns to the heart via the superior and inferior vena cava and flows from the right atrium into the right ventricle, with the tricuspid valve open and pulmonary valve closed.

Diastole (Left Side)

Phase in which blood from the pulmonary veins flows from the left atrium into the left ventricle, with the mitral valve open and aortic valve closed.

Systole (Right Side)

Phase in which blood from the right ventricle flows to the lungs, with the tricuspid valve closed and pulmonary valve open.

Systole (Left Side)

Phase in which blood from the left ventricle flows through the aorta to the body, with the mitral valve closed and aortic valve open.