🔬 A Trip Through Cell City

Hello! Today we are going on a trip to a tiny city. Its name is the cell. It has buildings, streets, and even a town hall. Are you ready?

Let’s look very, very closely at a leaf and at skin. Both are made of tiny little rooms: cells. All living things are made of cells.

Cells are very small. If we lined up an average cell side by side, about 50 cells would fit along a line 1 millimetre long. That is why we cannot see them with the naked eye. We need a microscope!

The city’s outer wall is the cell membrane. Water and food come in through its gates, and waste goes out. But the membrane does not let everything in: the membrane decides what can pass.

The streets inside the city are the cytoplasm. This jelly-like liquid fills the inside of the cell. The organelles sit in it, and materials are carried through it.

The city’s town hall is the nucleus. What the cell will do and how it will work is all written in the plans. These plans are DNA, the information that is passed on from parents. The nucleus is in charge of the cell.

The city’s power station is the mitochondria. They release energy from food, and the whole city runs on that energy. Cells that use a lot of energy have lots of mitochondria.

The little workshops are the ribosomes. They make the proteins the cell needs. The store is the vacuole: it keeps water, food and waste. In a plant cell the vacuole is very big.

A plant cell’s city is a little different. Outside the membrane there is a thick cell wall: it gives the cell its shape and protects it. Inside there are chloroplasts, like solar panels. They make food from light. An animal cell has neither of them.

Summary: the membrane is the walls and gates, the cytoplasm is the streets, the nucleus is the town hall, the mitochondria are the power station, the ribosomes are the workshops, and the vacuole is the store. A plant also has a cell wall and chloroplasts. Now try it in Cell City!