Cardiovascular System Quiz

Which of the following best describes the function of the sinoatrial (SA) node?

• Pumps blood to the lungs

• Initiates the heartbeat

• Filters blood in the kidneys

• Produces red blood cells

What is the correct order of blood flow through the heart?

• Left atrium → Left ventricle → Right atrium → Right ventricle

• Right atrium → Right ventricle → Left atrium → Left ventricle

• Left ventricle → Left atrium → Right ventricle → Right atrium

• Right ventricle → Right atrium → Left ventricle → Left atrium

Which blood component is responsible for clotting?

• Red blood cells

• White blood cells

• Platelets

• Plasma

What is the primary function of hemoglobin?

• Fighting infections

• Clotting blood

• Transporting oxygen

• Regulating blood pH

Which of the following best describes the phase of the cardiac cycle when the heart muscle relaxes?

• Cardiac output

• Diastole

• Ventricular contraction

• Stroke volume

What type of blood vessel has the thickest walls?

• Arteries

• Veins

• Capillaries

• Venules

Which of the following is the correct pathway of blood through pulmonary circulation?

• Left ventricle → Aorta → Body tissues → Right atrium

• Right ventricle → Pulmonary artery → Lungs → Left atrium

• Left atrium → Pulmonary vein → Lungs → Right ventricle

• Right atrium → Inferior vena cava → Liver → Left ventricle

What is the primary function of the coronary arteries?

• To supply blood to the brain

• To remove waste from the kidneys

• To supply blood to the heart muscle

• To transport oxygenated blood to the lungs

Which of the following is NOT a function of blood?

• Thermoregulation

• Photosynthesis

• Transport of nutrients

• pH buffering

What is the average resting heart rate for a healthy adult?

• 40-50 beats per minute

• 60-100 beats per minute

• 120-140 beats per minute

• 150-180 beats per minute