Cardiovascular System Lesson for Kids

Instructor: Michelle Madden
In this lesson, you will learn about one of the body's most important systems--the cardiovascular system. You will explore its different parts and see how each has its own special job.

What is the Cardiovascular System?

All eyes are on you as the ball comes your way. You can feel you heart beating in your chest as the ball gets closer. You take a step closer and kick the ball as hard as you can. At that moment, you feel a warm rush of excitement flowing through your body as you enjoy the feeling of scoring a goal!

When you enjoy a physical activity, such as soccer, cheerleading or running, you are giving your cardiovascular system a workout. The cardiovascular system is a group of organs that work together to transport oxygen, hormones, nutrients and any unusable substances from cells throughout your body.

There are many parts of the cardiovascular system, including blood, blood vessels and the body's major powerhouse--the heart. Let's learn more about each part of the cardiovascular system.

Diagram of a Human Heart
Heart diagram

The Heart

Your heart is a very important part of your body. It is a muscle that is responsible for pumping blood to your organs, cells and tissues. Even though the heart is only about the size of your fist, it is the hardest-working part of your body. Each minute, the heart pumps about 5 liters of blood through all of the blood vessels in your body. In one day, the heart pumps almost 4,000 gallons of blood and beats about 100,000 times!


You may already know that blood is the fluid that is circulating through your body. But did you know that your blood is actually a transporter? That's right--blood carries oxygen, nutrients and other useful substances throughout your body to organs, cells and tissues to keep you healthy and strong. Blood also helps to remove unwanted substances and waste from the body. Certain cells in blood help to keep your body healthy by fighting germs that try to make you sick.

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