The Circulatory System

Front

Main organ of the circulatory system?

Back

Heart

Front

What does blood carry?

Back

Oxygen, nutrients, CO₂

Front

The smallest blood vessels are the?

Back

capillaries

Front

Capillaries are so small that blood cells can only go through them one at a time. True or False

Back

True

Front

How does oxygen enter our blood in the lungs?

Back

diffusion

Front

What is the main function of the circulatory system?

Back

transportation

Front

Why do arteries have to be thicker and stronger than veins?

Back

Blood pressure is higher in arteries.

Front

Arteries carry blood ___________ from the heart, while veins carry blood ____  the heart.

Back

away, to

Front

Do veins always carry blood low in oxygen?

Back

False

Front

What is the largest artery in the human body?

Back

Aorta