Circulatory System Quiz

What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

Arteries carry oxygen rich blood away from the heart.

• True

• False

Veins carry oxygen poor blood back to the heart.

• False

• True

______________ are the smallest blood vessels.

• Arteries

• Veins

• Capillaries

The main function of the circulatory system is 

• To give the body structure and support

• Excrete waste

• transport blood, nutrients, and gases throughout the body

• to transport messages from the body to the brain

Why does your heart beat faster when you exercise?

• Your heart beats faster because the muscles needs more oxygen.

• Your heart beats faster you're afraid of pooping in your pants.

• Your heart does not beat faster when you exercise.

• Your heart beats faster because your lungs need more oxygen.

Which gas is transported by the circulatory system in humans and is used by cells during respiration to release energy stored in food?

• carbon dioxide

• nitrogen

• hydrogen

• oxygen

The diagrams show models of the circulatory systems of a fish and frog.

A student compared these diagrams. The student found that each of these organisms had a heart to pump blood. Which statement is supported by the student’s findings?

• Some organisms are composed of one cell, while others are multicellular.

• Many multicellular animals have similar organs and specialized systems.

• The circulatory system in most organisms removes solid wastes from their bodies.

• All animals have identical circulatory systems.

State one reason why blood at location B contains more oxygen than blood at location A.

• because blood at location A goes to the lungs

• because blood at location A comes from the lungs

• because blood at location B comes from the lungs

• because blood at location B goes to the lungs

State the general relationship between exercise and heart rate in humans.

• If a person exercises, then their heart rate will not change

• If a person exercises, then their heart rate will increase

• If a person exercises, then their heart rate will decrease

• Person exercising and heart rate are not related