What is an animal cell?
Every animal — from a sponge to a student — is built from cells, the smallest units that can carry out life on their own. Animal cells are eukaryotic, which means their DNA is sealed inside a membrane-bound nucleus rather than floating loose. Inside each cell, tiny structures called organelles divide up the work, much like the departments of a busy factory.
Click any part of the diagram above, or press Tab to move between parts with the keyboard and Enter to select. The info panel names the organelle and explains its job in one sentence. The button row underneath is a second way to pick a part, so nothing on the diagram is out of reach.
Meet the organelles
Each organelle has a clear role, and many of them work together:
- Nucleus — the control center; it stores the cell’s DNA and directs activity.
- Nucleolus — a dense spot inside the nucleus where ribosomes are assembled.
- Mitochondria — the powerhouses; they release energy as ATP through respiration.
- Rough endoplasmic reticulum — studded with ribosomes; it makes and folds proteins.
- Smooth endoplasmic reticulum — has no ribosomes; it builds lipids and detoxifies.
- Ribosomes — tiny factories that read genetic instructions to build proteins.
- Golgi apparatus — the post office; it packages and ships proteins and lipids.
- Lysosome — the recycling crew; its enzymes digest waste and worn-out parts.
- Vacuole — a storage sac for water, food, and waste (small in animal cells).
- Centrosome — organizes microtubules and helps separate chromosomes in division.
- Cell membrane — the flexible boundary that controls what enters and leaves.
- Cytoplasm — the jelly-like fluid that fills the cell and holds organelles in place.
A team, not a list
Notice how the parts connect. Ribosomes on the rough ER build a protein; the protein travels to the Golgi apparatus to be packaged; a vesicle ships it to where it is needed. Meanwhile mitochondria supply the energy that powers all of it. Learning the organelles as a working team — rather than a vocabulary list — is what helps the ideas stick.
Using this with a class
Project the diagram and play “name that job”: call out a function (“releases energy as ATP”) and ask students to find and select the matching organelle. Or hand out a blank cell sketch and have students label it, then check their work against the interactive. It is free to embed on your own class site or LMS page.