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Cells

Cells

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Cells. What is a cell?. What is a cell?. A cell is the very smallest unit of living matter. All living things , including plants and animals, are made up of cells. What is a cell?. A cell is like a chemical factory. What is a cell?. - PowerPoint PPT Presentation

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Page 1: Cells

Cells

Page 2: Cells

What is a cell?

Page 3: Cells

What is a cell?

A cell is the very smallest unit of living matter.

All living things, including plants and animals, are made up of cells.

Page 4: Cells

What is a cell?

A cell is like a chemical factory.

Page 5: Cells

What is a cell?

There are many different kinds of cells, doing many different jobs in a plant or animal.

Page 6: Cells

Differences between plant and animal cells?

Page 7: Cells

Animal and plant cells

The two kinds you need to be most familiar with are simple animal and plant cells.

Page 8: Cells

Cell membraneOne part found in all cells is the cell membrane.

Page 9: Cells

• What does the cell membrane do?

Page 10: Cells

Cell membraneThe cell membrane surrounds the cell and holds the cell together. It controls what chemicals can enter and leave the cell.

Page 11: Cells

NucleusAnother part found in all cells is the nucleus.

Page 12: Cells

• What does the nucleus do?

Page 13: Cells

NucleusThe nucleus controls the cell. Inside the nucleus is DNA which contains genetic information.

Page 14: Cells

CytoplasmAll cells also contain cytoplasm.

Page 15: Cells

• What does the cytoplasm do?

Page 16: Cells

CytoplasmCytoplasm is a jelly-like mixture of chemicals where most of the work of the cell takes place.

Page 17: Cells

Plant cell partsPlant cells may contain some extra parts.

Page 18: Cells

Chloroplasts (plant cells)Chloroplasts which are disc shaped and contain chlorophyll for photosynthesis.

Page 19: Cells

Cell wall (plant cells)A cell wall which is a strong outer layer to support the cell and give it shape.

Page 20: Cells

Vacuole (plant cells)A vacuole where the plant cell stores sap (the food that it has made; a mixture of sugars, salts and water).

Page 21: Cells

To summarise:

Page 22: Cells

More complicated!

In reality, most cells are much more complicated than this!

Page 23: Cells

Interesting cell facts:

Like all living things, cells die. If you watched a clock for one minute, about three billion cells in your body die.

x 3000000000

Page 24: Cells

Interesting cell facts:

In that same minute, about three billion cells divided so that all the cells that died were replaced.

x 3000000000

Page 25: Cells

Interesting cell facts:

Dead skin cells flake off and dead cells from internal organs will pass through and out of the body with waste products.

Page 26: Cells

Interesting cell facts:

The length of time cells live can vary. For example, white blood cells only live for thirteen days, red blood cells live for about one hundred and twenty days, liver cells live about eighteen months, and nerve cells can live up to one hundred years!

Page 27: Cells

Special cellsThere are many different types of cells to do different jobs in plants and animals.

For the 5 cells on this slide can you answer the questions below?

i. what they do

ii. How they are adapted to do their job

Muscle cells

Ciliated epithelial cell

Palisade cell

Root hair cell

Nerve cell

Page 28: Cells

Many of the same cells?

• What do you call a substance made of many of the same kind of cell?

Page 29: Cells

Tissues and organs

Cells of the same type can be grouped together to form tissues

Page 30: Cells

Muscle tissue

Muscle cells are grouped together to form muscle tissue.

Page 31: Cells

Root hair tissue

Root hair cells are grouped together to form root hair tissue

Page 32: Cells

Organs

Different kinds of tissue can be grouped together to make organs

Page 33: Cells

Heart

Page 34: Cells

Leaf

Page 35: Cells

Root

Page 36: Cells

Organ systems

Organs can work together in organ systems

Page 37: Cells

What’s this system called?

Page 38: Cells

Respiratory system

Page 39: Cells

?

Page 40: Cells

Excretory system

Page 41: Cells

?

Page 42: Cells

Circulatory system

Page 43: Cells

?

Page 44: Cells

Nervous system

Page 45: Cells

?

Page 46: Cells

Digestive system

Page 47: Cells

What is the sex organ of a plant called?

Page 48: Cells

Flowers!

Page 49: Cells

Do you know the names of the parts of a flower?

Page 50: Cells

Parts of a Flower

Carpel (female)

Stamen (male)