AS Structure and Function of the Heart

What is the mass of the human heart?

• 600g

• 450g

• 300g

• 150g

What separates the left and right sides of the heart?

• Ventricles

• Valves

• Septum

• Atria

Which valve separates the right atrium and right ventricle?

• Pulmonary valve

• Tricuspid valve

• Aortic valve

• Mitral valve

What is the function of the coronary arteries?

• Supply blood to the brain

• Supply blood to the heart muscle

• Supply blood to the kidneys

• Supply blood to the lungs

During which phase do the ventricles contract?

• Ventricular systole

• Atrial diastole

• Atrial systole

• Diastole

What is the role of the sinoatrial node (SAN)?

• To supply oxygen to the heart

• To prevent blood backflow

• To contract the ventricles

• To initiate a wave of depolarization

What happens during diastole?

• Atria contract

• Ventricles contract

• Both atria and ventricles relax

• Blood is pumped out of the heart

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

• To close the valves

• To initiate heartbeats

• To delay the contraction of the ventricles

• To supply blood to the heart

Which chamber of the heart has the thickest walls?

• Right atrium

• Left ventricle

• Left atrium

• Right ventricle

What is the primary function of heart valves?

• To increase blood pressure

• To prevent backflow of blood

• To supply oxygen

• To contract the heart muscle