Cells

YOU ARE LEARNING:

Intro to Cells

Organisms are made up of cells. There are many types of cells and they are really quite small.

Examples of cells

These are all examples of cells. What do cells look like?

There are many types of cells

This image alone shows 6 different types of cells that all have very special functions.

Nerve cells have a star-like shape. Type in the number that labels the nerve cell in this image.

Sperm cells have to be able to swim because they have to be able to reach the egg inside the female's body. Type in the number that labels the sperm cell in this image.

What do you think is the definition of a cell?

You find cells in ____________, in ____________ and in ____________.

You can select multiple answers

Cells make up organisms, like humans, animals, plants and bacteria

There are two types of organisms

Multicellular organisms and unicellular organisms.

What do you think a multicellular organism means?

So multicellular organisms consist of many cells. What does a unicellular organism mean then?

Which one of these organisms do you think is a unicellular organism?

So there are unicellular and multicellular organisms

Unicellular organisms are quite simple organisms, like bacteria. They consist of just a single cell.

Multicellular organisms are much more complex organisms, like plants, animals and humans. They consist of many many cells of many different types.

So humans are multicellular organisms. How many cells do you think you have in your body, roughly?

The size of cells

With trillions of cells in your body, what do you think is roughly the size of one of those cells?

So a cell in your body is around 0.01-0.1 millimetre big. How many cells does that mean you can fit next to each other in a millimetre?

Summary!

Cells are the smallest unit of life

There are many different types of cells that perform different functions.

For example nerve cells, sperm cells, blood cells, and muscle cells.

Cells make up organisms

Unicellular organisms, like bacteria, consist of just a single cell.

Multicellular organisms, like humans, animals and plants, consist of many cells of different types.

You have trillions of cells in your body!

So cells are super small. The cells in your body are only 0.01-0.1 millimetres big.