Cardiac Cycle

What is the first phase of the cardiac cycle?

• Atrial systole

• Atrial diastole

• Ventricular diastole

• Cardiac output

Which chamber of the heart receives blood from the body during the cardiac cycle?

• right atrium

• left ventricle

• right ventricle

• left atrium

What is the term for the relaxation phase of the heart during the cardiac cycle?

• systole

• contraction

• expansion

• diastole

What causes the closure of the atrioventricular valves during the cardiac cycle?

• Opening of the semilunar valves

• Decrease in ventricular pressure

• Increase in ventricular pressure

• Contraction of the atria

What is the term for the contraction phase of the heart during the cardiac cycle?

• diastole

• systole

• ventricle

• atrium

Which chamber of the heart pumps blood to the lungs during the cardiac cycle?

• aorta

• right ventricle

• left atrium

• left ventricle

What is the term for the period of time when the heart is contracting and pushing blood out?

• diastole

• cardiac cycle

• systole

• ventricle

What is the function of the sinoatrial node in the cardiac conduction system?

• Regulates blood pressure

• Produces red blood cells

• Controls body temperature

• Initiates the heartbeat and sets the pace for the heart's rhythm.

What is the role of the atrioventricular node in the cardiac conduction system?

• The atrioventricular node speeds up the electrical impulse to increase heart rate.

• The atrioventricular node regulates blood flow in the heart chambers.

• The atrioventricular node delays the electrical impulse to coordinate the timing of atrial and ventricular contractions.

• The atrioventricular node is responsible for oxygenating the blood.

How does the Purkinje fibers contribute to the cardiac conduction system?

• Purkinje fibers contribute by rapidly transmitting electrical signals to the ventricles, ensuring proper and synchronized contraction.

• Purkinje fibers contribute by storing excess blood in the heart chambers.

• Purkinje fibers contribute by regulating blood pressure in the arteries.

• Purkinje fibers contribute by secreting hormones that control heart rate.