Blood Facts: Lesson for Kids

Instructor: Lindsy Frazer

Dr. Frazer has taught several college level Science courses and has a master's degree in Human Biology and a PhD in Library and Information Science.

Did you know that there are different types of blood? That's right, your blood type may be different than your best friend's blood type. Learn about the different types of blood, what blood is made of and more amazing facts about blood in this lesson.

Hard-Working Blood

If you have ever scraped your knee, you have seen blood up close. But what exactly is that red liquid? Where does it come from? The thought of blood might gross you out, but blood has many important jobs in our bodies: it delivers oxygen, helps get rid of waste and helps us fight infections.

What Is Blood Made Of?

How are a bowl of chicken noodle soup and blood alike? Both soup and blood are made of liquid and solid ingredients. Chicken noodle soup is made of broth, the liquid part you slurp off your spoon, and solid noodles. Your blood is made of a liquid called plasma and three different types of cells. Each ingredient in your blood does a special job.

In this up close view of blood, you can see its main ingredients: plasma, red blood cells, white blood cells and platelets. The solid cells are floating in the liquid plasma.


Over half of blood is made of a yellow liquid called plasma. Plasma transports things, like nutrients and proteins, throughout the body. Plasma also works like a garbage truck because it carries away waste made by the cells in your body.

Red Blood Cells

Red blood cells are the most common type of cell found in your blood. Their main job is to carry oxygen to all of the other cells in your body, from your head to your toes.

White Blood Cells

Did you know that your blood has an army of germ fighters? White blood cells help protect your body from infection by attacking and killing germs.


The smallest cells that make up your blood are called platelets. Platelets are sticky little cells that work like bandages. If a blood vessel is broken, like when you cut yourself, platelets stick to the break to stop the bleeding and fix the broken vessel.

Platelets help repair broken blood vessels and stop bleeding.

How Is Blood Made?

Red blood cells, white blood cells, platelets, plasma, oh my! Blood sure has a lot of different parts. Your body makes all of these parts, so you could say you are a blood-making machine!

The solid parts of blood - red blood cells, white blood cells and plasma - are made by your bone marrow, the tissue in the middle of your bones. Plasma is mostly made of water, which your intestines absorb from the stuff you eat and drink.

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