Heart Structure and Function Quiz

What is the primary function of the sino-atrial node (SAN)?

• To contract the ventricles

• To generate electrical impulses

• To regulate blood pressure

• To fill the atria with blood

During which phase does the heart muscle relax?

• Ventricular contraction

• Atrial contraction

• Diastole

• Systole

What prevents backflow of blood from the ventricles to the atria?

• Septum

• Atrioventricular valves

• Sino-atrial node

• Semi-lunar valves

Which chamber of the heart receives deoxygenated blood from the body?

• Left atrium

• Right ventricle

• Right atrium

• Left ventricle

What is the role of the atrioventricular node (AVN)?

• To pump blood to the lungs

• To contract the atria

• To delay the impulse from the SAN

• To initiate the heartbeat

What happens to the atrioventricular valves during ventricular contraction?

• They become rigid

• They close

• They open

• They remain unchanged

Which of the following best describes the cardiac cycle?

• The flow of blood through the heart

• The sequence of heart contractions and relaxations

• The pressure changes in the arteries

• The electrical activity of the heart

What is the normal heart rate for a healthy adult at rest?

• 110 beats per minute

• 70 beats per minute

• 50 beats per minute

• 90 beats per minute

Which layer of tissue separate the left from the right sides of the heart?

• smooth muscle

• endothelium

• Septum

• epithelial

What is the primary function of the pulmonary artery?

• To supply blood to the heart muscle

• To return blood to the left atrium

• To carry deoxygenated blood to the lungs

• To carry oxygenated blood to the body