K-5 friendly lesson
One small step at a time.Read the idea, try the activity, and celebrate each win as you go.
Body Building Blocks
Your body is built from tiny cells that team up!
Do this: Read the concept below, then try the quiz or activity.
Lesson 1 of 18
Concept
Cells join to form tissues. Tissues build organs. Organs work together in systems to keep you alive and active.
Put the levels in order
These steps are out of order — can you fix them?
1.Organs
2.Systems
3.Cells
4.Tissues
Quick Terms
1 / 3Cell
(Click to flip)The smallest living building block
(Click to flip back)From Small to Big
Cells
→Tissues
→Organs
→Systems