The Heart and Blood for Kids: Your Body's Delivery System (Grade 4 and Grade 5 Science)

Hi, I'm Luna from DoodleBeez. Put your hand on your chest. Can you feel a thump? That is your heart. Today we will learn how your heart and blood work as your body's delivery system.

Your heart is a strong muscle about the size of your fist. It pumps all day and all night without resting. Each beat pushes blood out to every part of your body.

Blood travels through tubes called blood vessels. Arteries carry blood away from the heart. Veins carry blood back to the heart. Tiny capillaries connect them, reaching almost every cell in your body.

Your heart works with your lungs. The right side of the heart sends blood to the lungs to pick up oxygen. The left side pumps that oxygen rich blood out to the rest of your body.

Blood is a delivery truck. It carries oxygen from your lungs and nutrients from your food to every cell. On the way back, it picks up wastes, like carbon dioxide, which you breathe out.

Blood has a team of parts. Red blood cells carry oxygen. White blood cells fight germs. Platelets help plug a cut so it stops bleeding. They all float in a yellowish liquid called plasma.

Now it's your turn. Which kind of blood vessel carries blood away from the heart? Pause and try. It is an artery! Arteries carry blood away, and veins bring blood back to the heart.

Great job! Remember, your heart is a muscle that pumps blood. Arteries carry it away, veins bring it back, and blood delivers oxygen and nutrients. Practice the heart and blood in the Science Lab at doodlebeez.com. See you next time!