Heart and Circulatory System Quiz

What is the function of the heart?

• To filter toxins from the blood

• To pump blood throughout the body

• To produce oxygen for the blood

• To store excess blood

Where is the heart located?

• In the left lung

• Behind the stomach

• In the mediastinum between the lungs

• Below the liver

What layer of the heart contains cardiac muscle and is responsible for contraction?

• Epicardium

• Myocardium

• Endocardium

• Fibrous pericardium

What is the function of the fibrous pericardium?

• It lines the chambers of the heart

• It prevents friction between heart layers

• It anchors the heart and prevents overfilling

• It pumps blood into the ventricles

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

• Left atrium

• Right atrium

• Left ventricle

• Right ventricle

What valve prevents backflow of blood into the right atrium?

• Aortic semilunar valve

• Pulmonary semilunar valve

• Tricuspid valve

• Bicuspid (mitral) valve

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

• Pulmonary artery

• Pulmonary vein

• Aorta

• Inferior vena cava

What is the largest artery in the body?

• Pulmonary trunk

• Superior vena cava

• Aorta

• Brachial artery

What is the function of the coronary arteries?

• To remove deoxygenated blood from the heart

• To supply oxygenated blood to the heart muscle

• To carry blood from the heart to the lungs

• To store excess blood for later use

What structure acts as the heart's natural pacemaker?

• SA node

• AV node

• Purkinje fibers

• Aorta