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The Heart Pumps Blood All Around Your Body · My Body and Its Parts · heart · blood

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The Heart Pumps Blood All Around Your Body

with Medi

Inside a cozy body-shaped room with glowing red pathways spreading out like roads, Medi holds a soft squishy heart model and squeezes it gently, sending tiny red drops traveling along the glowing paths to fingers, toes, and a smiling brain.

Identify the heart as a body part found inside the chest, a little to the left.
Explain that the heart's job is to push blood to all parts of the body.
Describe what a heartbeat feels like when you place your hand on your chest.
Demonstrate the squeezing motion of the heart by opening and closing your fist.

Key terms

heart: A muscle in your chest that pumps blood around your body.
pump: Something that pushes a liquid from one place to another.
blood: The red liquid that carries food and oxygen around your body.
blood vessel: A tiny tube that blood travels through inside your body.
heartbeat: One squeeze of your heart that pushes blood forward.

The Heart Is a Pump

Your heart is a muscle about the size of your fist, sitting in your chest a little to the left. It works like a pump, which is a machine that pushes liquid from one place to another. The liquid your heart pumps is blood, and every squeeze of your heart gives that blood a strong push forward through your body.

Blood Travels Everywhere

Blood moves through tiny tubes called blood vessels that reach every part of you. The heart pushes blood out to your fingers, toes, and brain, carrying food and oxygen they need. Then the blood loops back to the heart to get another push. This circle of pumping out and coming back happens over and over all day long.

Never Taking a Break

Your heart never stops, not even when you sleep, because your body always needs fresh blood. A child's heart beats roughly 70 to 100 times each minute while resting, and faster during play. You can feel each beat as a thump on your chest or a pulse on your wrist, proof that your heart is always at work.

Worked examples

Explain what makes the thump-thump on your chest.

Each thump happens when the heart muscle squeezes.
That squeeze pushes blood out into the blood vessels.
So the thump-thump you feel is your heart beating.

Answer: The thump-thump is your heart squeezing to pump blood.

Decide whether the heart rests while you sleep.

Your body needs blood all the time to stay alive.
If the heart stopped, blood would stop moving.
So the heart keeps beating even while you sleep.

Answer: No, the heart keeps beating all the time, even when you sleep.

Hi there! I am Medi, and today we are going to learn about one very important body part — your heart! Your heart is inside your chest, a little to the left. Put your hand on the left side of your chest and you might feel a little thump-thump — that is your heart beating! Your heart is like a pump. A pump pushes liquid from one place to another. Your heart pumps blood. Blood is a red liquid that travels inside your body through tiny tubes called blood vessels. Every time your heart beats — thump-thump — it gives blood a little push. The blood travels from your heart all the way to your fingers, your toes, your brain, and every other part of you. Then it comes back to the heart to get another push. Your heart never stops working, even when you are asleep! Here is a clue: squeeze your hand into a fist and open it, then squeeze again. That squeezing is a little bit like what your heart does every single beat!

Activity

Help Medi sort these pictures — which ones show a job the heart does?

Practice

Where in your body is your heart found, and what does it pump?

Why must your heart keep beating even while you are sleeping?

Common mistakes to avoid

The heart rests when you sleep.The heart beats all the time, day and night, because the body always needs blood.
The heart helps you breathe in air.Breathing is the lungs' job; the heart pumps blood that carries oxygen around the body.

Check your understanding

What is the main job of the heart?

Where is your heart found inside your body?

You put your hand on your chest and feel thump-thump. What is making that feeling?

Medi says the heart keeps working even when you sleep. Is that true?

Recap

Your heart is a muscle that works like a pump, pushing blood through tiny vessels to every part of your body and back again. It beats all the time, even while you sleep, because your body always needs fresh blood.

Reflect

How does it feel to find your own pulse, and why do you think it changes when you run?