Unicellular and pluricellular living thingsPresentation Transcript
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
How do cells 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 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.