Heart Circulation

What is the main function of the human heart?

• To pump blood

• To control body temperature

• To digest food

• To produce energy

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

• left atrium

• right ventricle

• left ventricle

• right atrium

What is the direction of blood flow in the heart?

• From body to left atrium

• From lungs to right ventricle

• From left ventricle to right atrium

• From body to right atrium, right ventricle, lungs, left atrium, left ventricle, and out to the body

During which phase of the cardiac cycle does the heart relax and fill with blood?

• Systole

• Diastole

• Atrial contraction

• Cardiac output

What is the purpose of heart valves?

• To aid in digestion

• To regulate air flow in the lungs

• To control body temperature

• To regulate blood flow and prevent backflow in the heart chambers.

Which coronary artery supplies blood to the left side of the heart?

• Lower coronary artery

• Middle coronary artery

• Right coronary artery

• Left coronary artery

What regulates the heart rate?

• Endocrine system

• Digestive system

• Autonomic nervous system

• Central nervous system

What is the innermost layer of the heart called?

• Epicardium

• Endocardium

• Pericardium

• Myocardium

What is the role of the atrioventricular valves in the heart?

• Prevent backflow of blood from the ventricles to the atria during contraction

• Control the heart rate

• Assist in the oxygenation of blood

• Regulate blood pressure in the heart chambers

What is the function of the sinoatrial node in the heart?

• Controlling body temperature

• Initiating electrical impulses for the heartbeat

• Producing red blood cells

• Regulating blood pressure