CIRCULATORY SYSTEM

Multiple Choice

Which of the following best describes a closed circulatory system?

• Blood is always contained within vessels and does not mix with body fluids.

• Blood flows freely throughout the body without vessels.

• Blood only circulates through the heart and not the rest of the body.

• Blood mixes with digestive fluids in the body.

Open Ended

Why is the circulatory system important for the survival of living organisms?

Multiple Choice

Which part of the heart is responsible for pumping oxygenated blood to the rest of the body?

• Right Atrium

• Right Ventricle

• Left Atrium

• Left Ventricle

Open Ended

Explain the role of valves in the heart and how they contribute to the flow of blood.

Multiple Choice

Which of the following statements about blood vessels is correct?

• Arteries carry deoxygenated blood to the heart.

• Veins have thick, elastic walls to handle high pressure.

• Capillaries are the site of nutrient and gas exchange.

• Veins carry oxygenated blood away from the heart.

Open Ended

What are the main components of blood and their functions?

Multiple Choice

Which layer is the most abundant in plasma after blood is centrifuged?

• Red Blood Cells

• White Blood Cells

• Platelets

• Plasma

Multiple Choice

Which of the following is NOT a function of blood?

• Transporting hormones

• Carrying oxygen

• Producing insulin

• Defending against germs

Multiple Select

Which features are true for veins?

• Carry blood away from the heart

• Have thick and muscular walls

• Contain valves

• Carry deoxygenated blood (usually)

Multiple Choice

What is the main function of the circulatory system in the body?

• To digest food

• To transport blood and materials

• To control movement

• To produce hormones