It's because of 'Hemoglobin,' a protein that contains iron and carries oxygen.

What happens when I get a scab?

Platelets stick together to form a net, trapping blood cells to create a natural bandage called a scab.

Body

Red, White, and Platelets: What's in Your Blood?

April 9, 2026Ages 3–9

Key Insight

Blood is more than red water; it’s full of red cells, white cells, and more. Use a microscope to explore the tiny world inside you!

📖 Explanation

🧒 For 3-5 Years Old

If you get a small scrape, you see red blood. It's like a tiny river inside you! It carries yummy food and oxygen to all your muscles so you can play all day.

🎒 For 6-9 Years Old

Three Main Parts

Blood is made of Red Blood Cells (carrying oxygen), White Blood Cells (the fighters), and Platelets (the fixers that stop bleeding). They all float in a liquid called Plasma.

Blood Types

Did you know humans have different blood types like A, B, AB, or O? This depends on tiny markers on your red blood cells. It's like having a special ID card for your body!

❓ Frequently Asked Questions

Why is blood red?: It's because of 'Hemoglobin,' a protein that contains iron and carries oxygen.
What happens when I get a scab?: Platelets stick together to form a net, trapping blood cells to create a natural bandage called a scab.

🧠 Quick Knowledge Check

Q1 / 20%

Why is blood red?

Step 1 / 2

🧪 Microscopic World of Blood

~30 min

Observe prepared slides of human blood cells to see the different shapes.

🛒 Supplies

📋 Steps

1
🔬 Set up the Microscope
Place a prepared slide of a 'Human Blood Smear' on the microscope stage.
2
🔴 Find the Cells
Look for tiny red donuts (red blood cells) and larger, purple-stained cells (white blood cells).

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Inside you is an 'immune system' army fighting germs. White blood cells are the soldiers that find and destroy viruses so you can get well soon!

The Blueprint of Life: Extracting DNA at Home

Your body has a hidden 'blueprint' called DNA that decides your hair color and more. Let's use a kit to see real DNA strands from a banana!

Listen to the Rhythm! The Secret of Your Heartbeat

Your heart works 24/7 to pump blood. That 'thump-thump' sound is actually the heart's valves closing like doors! Use a stethoscope to hear your own rhythm.