The Circulatory System Quiz

What is the primary function of the heart?

• To control body temperature

• To filter blood

• To maintain blood pressure

• To produce blood cells

What do blood vessels NOT do?

• Carry away waste products

• Generate electrical impulses

• Carry oxygen and nutrients

• Contract and expand

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

• Venules

• Veins

• Capillaries

• Arteries

What is the approximate total length of all blood vessels in the human body?

• 1,000 kilometers

• 50,000 kilometers

• 100,000 kilometers

• 10,000 kilometers

What happens when you blush?

• Blood vessels contract

• Blood vessels expand

• Blood vessels burst

• Blood vessels filter toxins

What is the innermost layer of a blood vessel called?

• Tunica media

• Tunica intima

• Endothelium

• Tunica externa

Which blood vessels have the thickest tunica media?

• Capillaries

• Arterioles

• Elastic arteries

• Muscular arteries

What is the main function of capillaries?

• To store blood

• To exchange nutrients and wastes

• To carry blood back to the heart

• To regulate blood pressure

How do veins help maintain blood flow direction?

• By expanding

• By contracting

• By having venous valves

• By filtering blood

What can cause varicose veins?

• Too much blood in capillaries

• Expansion of arterioles

• Leaking venous valves

• Too much muscle tissue