Cells
⭐ MasteredCells are the tiny building blocks of all living things. Some living things, like bacteria, are just one cell.
Your body has trillions of cells.
All about Cells
A cell is the smallest unit of life. Cells are tiny building blocks that make up all living things. Your body has trillions of them, and each type of cell has a specific job, such as carrying oxygen or sending nerve signals.
Most cells have a membrane, cytoplasm and a nucleus that holds genetic information. Plant cells also have a cell wall and chloroplasts. Bacteria are single-celled organisms, so one cell is their whole body.
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Real-life uses of Cells
- Understanding how diseases affect the body
- Growing new skin and bone after an injury
- Making yeast bread rise, using yeast cells
Frequently asked questions about Cells
Who discovered cells?
Robert Hooke first described cells in 1665 after looking at cork through a microscope. The name came from the small rooms, or cells, he saw.
What is the difference between plant and animal cells?
Plant cells have a cell wall, chloroplasts and a large central vacuole. Animal cells do not have these parts.
Can you see cells without a microscope?
Usually not. Most cells are too small to see without magnification. Some eggs and plant tissues are large enough to see with the naked eye.