IB Biology Heart

The thin innermost layer of the heart

• Myocardium

• Epicardium

• Endocardium

• Septum

The thin layer of the heart that is made of connective tissue and fat

• Endocardium

• Epicardium

• Myocardium

• Septum

What is the role of the pulmonary artery in blood circulation?

• To carry oxygenated blood from the lungs to the heart

• To carry deoxygenated blood from the heart to the lungs

• To carry oxygenated blood from the heart to the body

• To carry deoxygenated blood from the body to the heart

Which blood vessel carries oxygenated blood from the lungs to the heart?

• Pulmonary artery

• Pulmonary vein

• Aorta

• Vena cava

What is the function of the atrioventricular (AV) node in the heart?

• To initiate the heartbeat

• To delay the electrical impulse before it passes to the ventricles

• To pump blood into the aorta

• To regulate the heart rate

Which chamber of the heart receives oxygenated blood from the lungs?

• Right atrium

• Left atrium

• Right ventricle

• Left ventricle

What is the primary function of the coronary arteries?

• To supply blood to the heart muscle

• To carry blood away from the heart

• To regulate blood pressure

• To remove waste products from the heart

Which part of the heart is responsible for pumping oxygenated blood to the rest of the body?

• Right atrium

• Left atrium

• Right ventricle

• Left ventricle

What is the role of the sinoatrial (SA) node in the heart?

• To act as the heart's natural pacemaker

• To delay the electrical impulse

• To contract the ventricles

• To open the heart valves

Which structure prevents the backflow of blood from the left ventricle to the left atrium?

• Tricuspid valve

• Mitral valve

• Aortic valve

• Pulmonary valve