Heart

The human heart is divided into how many chambers?

• Two

• Three

• Four

• Five

The valve present between the right atrium and right ventricle is the:

• Bicuspid valve

• Aortic valve

• Tricuspid valve

• Semilunar valve

The wall of the heart is primarily made of:

• Pericardium

• Myocardium

• Endocardium

• Cartilage

The natural pacemaker of the heart is the:

• AV node

• Bundle of His

• SA node

• Purkinje fibers

Why does the left ventricle have a thicker wall than the right ventricle?

• It receives more blood

• It stores oxygen

• It pumps blood to the whole body

• It contains more valves

What is the function of the semilunar valves?

• Prevent backflow into atria

• Prevent backflow into ventricles

• Allow oxygen diffusion

• Generate electrical impulses

What causes the “lub-dub” sound of the heartbeat?

• Opening of valves

• Contraction of atria

• Closure of heart valves

• Movement of blood

During which phase does the heart fill with blood?

• Systole

• Diastole

• Isovolumetric contraction

• Ventricular ejection

A patient has a leaky mitral valve. What would likely result?

• Blood flows backward into the left atrium

• Blood is blocked from the lungs

• Heartbeat increases abnormally

• No change in circulation

If the SA node fails, the heartbeat is controlled by:

• AV node

• Right ventricle

• Pulmonary valve

• Coronary artery