Learn about the tiny building blocks of your body!
Cells are the tiny building blocks that make up your whole body!
You have about 37 trillion cells - that's 37,000,000,000,000!
Click on the cell parts below to learn what they do.
Click on any part of the cell to learn what it does. Each part has an important job!
The nucleus is the brain of the cell! It holds all the cell's DNA instructions and tells the other parts what to do.
Mitochondria are the powerhouses of the cell! They take food and oxygen and turn them into energy the cell can use.
Ribosomes are tiny protein factories! They read instructions from DNA and build proteins that the cell needs.
The ER is like a highway system inside the cell! It helps move things around and processes proteins.
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Educational content created by J Radler for the biotech and scientific community. Last updated: February 4, 2026.
Free to share for educational purposes with attribution.
FDA Modernization Act 3.0 Educational Resource
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