Circulatory System Worksheet

The organ that pumps blood throughout the body is the _______________.

• heart

• liver

• kidney

• lung

The heart is protected by the _______________.

• ribcage

• skull

• pelvis

• spine

_______________ carry blood away from the heart.

• Arteries

• Veins

• Capillaries

• Valves

The _______________ receive blood in the heart.

• atria

• ventricles

• arteries

• veins

Blood removes _______________ and other wastes from the cells.

• carbon dioxide

• oxygen

• glucose

• proteins

Which of these is NOT part of the circulatory system?

• Heart

• Lungs

• Blood

• Blood vessels

What kind of blood does the left side of the heart contain?

• Deoxygenated blood

• Oxygenated blood

• Mixed blood

• No blood

Which blood vessel has thick walls and carries blood away from the heart?

• Vein

• Capillary

• Artery

• Valve

What is the main function of blood capillaries?

• Carry blood to the lungs

• Connect arteries with veins

• Pump blood

• Protect the heart

The main difference between arteries and veins is:

• Arteries carry blood away from the heart, while veins carry blood toward the heart.

• Arteries carry blood toward the heart, while veins carry blood away from the heart.

• Both arteries and veins carry blood away from the heart.

• Both arteries and veins carry blood toward the heart.