Learn it
Your body is built in levels, like building blocks.
- Cells are the tiniest living units. You have trillions of them: skin cells, muscle cells, nerve cells, blood cells and more.
- Many similar cells working together make a tissue, like muscle tissue.
- Different tissues working together make an organ, like the heart, stomach or brain.
- Organs working together form an organ system, like the digestive system.
🔎 Amazing facts
- Your skin is your body’s largest organ.
- Red blood cells are made inside your bones.
🧪 Try it: Body levels model
- Draw one small circle and label it ‘cell’.
- Draw a group of circles and label it ’tissue’.
- Draw a heart shape made of that tissue: ‘organ’.
- Draw the heart with blood vessels: ‘organ system’.
Think about it: Why might different cells have different shapes?