What is the primary function of the circulatory system?

• To produce hormones

• To transport blood, nutrients, gases, hormones, and wastes

• To digest food

• To store energy

Which component of the blood is responsible for carrying oxygen using hemoglobin?

• White Blood Cells (WBCs)

• Platelets

• Red Blood Cells (RBCs)

• Plasma

What is the role of the right ventricle in the heart?

• Receives oxygenated blood from the lungs

• Pumps deoxygenated blood to the lungs

• Pumps oxygenated blood to the body

• Receives deoxygenated blood from the body

Which type of blood vessel carries oxygenated blood away from the heart?

• Veins

• Capillaries

• Arteries

• Lymph vessels

How do capillaries function in the circulatory system?

• They pump blood to the heart

• They carry oxygenated blood away from the heart

• They are pathways for blood flow

• They are sites for gas and nutrient exchange

What is the function of the tricuspid valve in the heart?

• It prevents backflow of blood between the left atrium and left ventricle.

• It prevents backflow of blood between the right atrium and right ventricle.

• It prevents backflow of blood between the left ventricle and aorta.

• It prevents backflow of blood between the right ventricle and pulmonary artery.

Which phase of the cardiac cycle involves the heart filling with blood?

• Systole

• Diastole

• Contraction

• Relaxation

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

• It relays impulses to the ventricles.

• It transmits signals for ventricular contraction.

• It acts as the pacemaker of the heart.

• It prevents backflow of blood.

Why are arteries thick-walled and elastic?

• To allow exchange of gases, nutrients, and wastes.

• To prevent backflow of blood.

• To withstand high pressure.

• To form a network between arterioles and venules.

Explain the importance of capillaries in the circulatory system.

• They prevent backflow of blood.

• They allow exchange of gases, nutrients, and wastes.

• They act as the pacemaker of the heart.

• They transmit signals for ventricular contraction.