LIVING BEINGS

All living beings are made up of cells

Life started long time ago...

Every single living being

evolved from simpler

structures of cells than

they are now.

Unicellular living beings

Their bodies are made up of one cell,like virus and bacterium

Cells organized in groups becoming into a new structure.

What are CELLS?• Cells are the tiny building blocks of

living things.• All cells, whether plant or animal have

the same basic parts: cell membrane, cytoplasm, nucleus,nuclear membrane,vacuoles and mitochondria.

Each part performs a specific function.• A cell is able to reproduce by means

of splitting. Previously the nucleus doubles and divides in half so each new cell has a copy of the cell´s instructions

ANIMAL CELL

How do cells How do cells work?work?

• They use their parts to perform different jobs.

• Cell membrane separates it, gives the cell its shape and control what goes into and out of it.

• Cytoplasm is a jellylike liquid. It is inside the cell membrane.

• Vacuoles are tiny oval structures that store food, water or wastes. They are inside the cytoplasm.

• Mitochondria helps to change food into the necessary energy to do the cell work. It is inside the cytoplasm too.

• Nucleus contains the instructions for running the cell. It is surrounded by the nuclear membrane whose function is similar to cell membrane.

PLANT CELL

PLANT CELLS HOWEVER...

• ...have two additional parts that animal cells do not.

• Plant cells have cell walls around the cell membrane to support and protect the cell.

• Plant cells also contain chloroplasts with a green substance called chlorophyll.Chlorophyll traps energy from sunlight and enables the plant to make its own food.

Cells form tissues

CELLS ARE DIFFERENT

• Cells do not all look the same. Their shape depends on the job they do.

• A group of cells which carry out a specific task form a tissue.

• All tissues that make a common function form an organ.

Tissues, organs and systems

There are several systems in the bodies of living beings that are organized and

specialized to do specific tasks .

All systems have to work at the same

time in a coordinated

process.