What is the primary function of the coronary arteries?

• To supply oxygen to the lungs

• To provide the heart muscle with a reliable blood supply

• To regulate the heart's rhythm

• To remove waste products from the heart

Where does the left coronary artery divide into the anterior interventricular coronary artery and the circumflex artery?

• At the back of the heart

• At the apex of the heart

• Within an inch of the aorta on the front of the heart

• At the right side of the heart

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

• It acts as the pacemaker of the heart

• It pumps blood to the ventricles

• It regulates blood pressure

• It terminates the impulse in the Purkinje fibers

Which chemical is secreted by the vagus nerve to slow the heart rate during rest and sleep?

• Epinephrine

• Acetylcholine

• Norepinephrine

• Dopamine

How does epinephrine help during CPR?

• It decreases arterial blood pressure.

• It increases arterial blood pressure and coronary perfusion.

• It reduces blood flow to the heart.

• It slows the heart rate.

What is the primary function of the systemic circulation in the human body?

• To carry oxygenated blood from the left ventricle to all parts of the body

• To carry deoxygenated blood from the right ventricle to the lungs

• To separate oxygenated and deoxygenated blood in the heart

• To return oxygenated blood to the right atrium

What structure separates oxygenated and deoxygenated blood in the heart?

• Pulmonary trunk

• Aorta

• Interatrial and interventricular septum

• Pulmonary veins

What is the smallest type of artery called?

• Capillaries

• Arterioles

• Venules

• Venae cavae

Which veins deliver systemic blood to the right atrium?

• Pulmonary veins

• Arterioles

• Superior and inferior venae cavae

• Capillaries

What is the purpose of cardiac catheterization?

• To measure blood sugar levels in the body

• To sample blood in each heart chamber for oxygen content and pressure

• To inject medication directly into the lungs

• To monitor brain activity during surgery