Parts of the Circulatory System: Lesson for Kids

Instructor: Rebecca Gillaspy

Dr. Gillaspy has taught health science at University of Phoenix and Ashford University and has a degree from Palmer College of Chiropractic.

When oxygen, nutrients and cell wastes need to move around your body, they travel through your circulatory system. Learn about the parts of your circulatory system, including your heart, blood vessels and blood.

Circulatory System

Even when you're sound asleep, things are constantly being moved around inside of you. Things like oxygen, nutrients and cell wastes need to move through your body so you can live and grow. But how do they get around? Your body has a system for moving things around called your circulatory system!


Your heart is an important part of your circulatory system. It's one of the busiest workers in your body, pumping your blood through your body about 100,000 times a day. That's three million times each month! There's no vacation for your heart - every day it's work, work, work.

Your heart is not shaped like the cute hearts we see around Valentine's Day. It's a muscular organ that looks like it has tubes going in and out of it. Your heart sits on the left-hand side of your chest. It has four rooms called chambers. The two chambers on the top are called atria. They provide a space for blood to come into your heart. The two chambers on the bottom are called ventricles. They pump blood out of your heart.

Inside the Heart

The chambers of your heart have valves between them. These valves open and close to make sure blood goes through your heart in a one-way path. When these valves close, they make a noise that sounds like lub-dub. This sound is what you think of as your heartbeat. When your doctor listens to your heartbeat, he or she is listening to your heart valves!

Blood and Blood Vessels

The tubes that go in and out of your heart are blood vessels. They travel to every part of your body. You can think of them as your body's roadways. But instead of cars, your body's roads carry blood.

Blood is the fluid that moves through your circulatory system. Do you remember how we said that your circulatory system carries things like oxygen, nutrients and cell wastes around your body? Those things mix into your blood and hitch a ride through your blood vessels.

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