cardiac cycle of heart

What is the cardiac cycle

What happens in a single heartbeat

How long is a cardiac cycle in a healthy adult

0.8 sec

Does the heart relax or contract in diastole

Relax

What parts of the heart fill with blood in the diastole

Atria and ventricle

What part of the heart is the pressure low at diastole

Arteries

Does the volume/pressue increase/decrease in the diastole

The volume and pressure increase in diastole

What contracts first and what contracts afterwards in the systole

The atria contracts first followed by the ventricles (ventricular systole)

What happens to the volume and pressure in the end of the systole stage

The volume and pressure decrease by the end of the stage

What part of the heart is at highest pressure beginning of systole

Arteries at high pressure and volume is low at the start of the systole

What happens on the left and right side of the heart in the systole stage

The left side -oxygenated blood taken to the body

Right side - deoxygenetaed blood is taken to the lungs

What happens to the pressure of the heart at teh start of the systole

Pressure of heart increases increases dramatically at. The start of the systole

What happens to the wall of the atria at atrial systoleand why

The walls of the atria contract at atrial systole (volume decreases + pressure increases)

When do the atrioventricular valves open and what happens after that?

When the pressure in the atria rises that above the pressure in the ventricles

AV valves open

Blood forced into ventricles and the ventricular pressure and volume increases as receives blood

What happens to the wall of the ventricle at ventricular systole and what does that cause

Walls of ventricle CONTRACT

Pressure increases Volume decreases

When does the AV close

When the pressure rises over that in the atria

When do the semi lunar valves open in the ventricular systole stage

Pressure rises over that in aorta and pulmonary artery - SL valves open - blood forced into arteries and out of heart

What happens to the ventricles and atria in the diastole stage

Relax

What happens at the end of diastole

Pressure in ventricles drop below aorta and artery - SL valves close

Atria continue to flow with blood - pressure rises over that in the ventricles - AV valves open and cycle occurs again