Circulatory System Quiz

What is the main organ responsible for pumping blood in the circulatory system?

• Lungs

• Heart

• Kidneys

• Liver

Which blood vessels carry blood away from the heart?

• Veins

• Arteries

• Capillaries

• Alveoli

How does exercise affect the circulatory system?

• Slows down heart rate

• Increases blood pressure

• Decreases oxygen intake

• Improves circulation

Which component of blood is responsible for carrying oxygen to the body's cells?

• White blood cells

• Platelets

• Red blood cells

• Plasma

Explain the role of valves in the circulatory system.

• Prevent backflow of blood

• Pump blood to the lungs

• Produce new blood cells

• Filter waste from blood

Which blood vessel carries oxygen-rich blood back to the heart?

• Veins

• Arteries

• Capillaries

• Alveoli

Why is the circulatory system considered a closed system?

• Blood only flows in one direction

• Blood vessels are tightly sealed

• Blood never leaves the body

• Blood flows in a continuous loop

How can a healthy diet impact the circulatory system?

• Decrease blood pressure

• Improve cholesterol levels

• Slow down heart rate

• Reduce oxygen intake

Which part of the circulatory system is responsible for exchanging nutrients and gases with body tissues?

• Heart

• Lungs

• Liver

• Capillaries