The Heart and the Cardiac Cycle

During the systole phase of the cardiac cycle, the ventricles....

• Contract
• Relax

What is the definition of the Cardiac Cycle?

• the contraction of the atria
• the sequence of events that occur during one complete heartbeat
• the contraction and relaxation of the ventricles
• 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

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

• left atrium

• right atrium

• left ventricle

• right ventricle

Diastole refers to what action?

• Filling/ relaxing

• Pumping/ contracting

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

• the left ventricle pumps blood to the body

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

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

The 'Lub' sound of the heart's LUB DUB? are the....

• Atrioventricular valves closing
• Semilunar Valves closing
• Blood flowing through the Pulmonary Trunk and Aorta
• Blood Flowing down into the venticles

The 'Dub' sound of the heart's LUB DUB? are the....

• Atrioventricular valves closing
• Semilunar Valves closing
• Blood flowing through the Pulmonary Trunk and Aorta
• Blood Flowing down into the venticles

Which of the following is true about the semi-lunar valves in the heart?

• They are between atria and ventricles

• They close when pressure in the arteries is higher than pressure in the atria

• They prevent backflow of blood into the atria

• They open when pressure in the ventricles is higher than pressure in the arteries

During ventricular systole, which of the following occurs?

• Atrioventricular valves close and semilunar valves close

• Atrioventricular valves close and semilunar valves open

• Atrioventricular valves open and semilunar valves are open

• Atrioventricular valves open and semilunar valves close