The Cardiac Cycle

Diastole refers to what action?

• Filling

• Pumping

Systole refers to what action?

• Filing

• Pumping

The Vena Cava delivers blood to the heart into the.....

• left atrium

• right atrium

• left ventricle

• right ventricle

During ventricular systole what is happening?

• the ventricles are relaxed and the atria contracted

• the ventricles and the atria are relaxed

• the ventricles and the atria are contracted

• the ventricles are contracted and the atria are relaxed

Deoxygenated blood is found on the left side of the heart. True or false?

• True

• False

Oxygenated blood returns to the heart via the Pulmonary vein to the ...

• Left atrium

• Right atrium

• Left ventricle

• Right ventricle

Oxygenated blood is pumped from the left ventricle to the rest of the body via...

• the pulmonary vein

• the pulmonary artery

• the vena cava

• the aorta

What is the definition of the cardiac cycle?

• The contraction of the atria

• The contraction and relaxation of the ventricles

• The sequence of events that occur during one complete heartbeat

• The circulation of blood in the heart

During ventricular ejection (blood being ejected from the ventricles when they contract)

• Only the AV valves open

• The semilunar valves open and the AV valves close.

• Only the semilunar valves close.

• The semilunar valves close and the AV valves open

Answer explanation

Ventricular ejection occurs as the continuing contraction of the ventricles increases the pressure in the ventricles and forces the semilunar valves open. At this point blood is forced out of the ventricles.

Why are the walls of the left ventricle thicker than that of the right ventricle?

• The left ventricle must force blood into all the capillaries of the lungs

• This is false, the walls of the right ventricle are thicker

• The left ventricle pumps blood to the body

• Blood from the left ventricle is pumped around the entire body with greater force