Download Presentation on Cells

Are all the cells same?
Abid Raza
PrepI-C
30th July 2009
Why are cells different?
Some animal and plant cells are made of just one cell, or just
few cells. All of their cells have to carry out all the processes
of life. However, large organisms are more complicated and
they have different organs to do different jobs.
The shape and structure of each cell help each one to do its
Job properly.
Specialised Cells
Humans are made of lots of cells, not just one cell. The
cells in many multi-cellular animals and plants are
specialised, so that they can share out the processes of
life. They work together like a team to support the
different processes in an organism. We say the cells
are specialised because they have special structure
for special function.
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Red Blood Cell
Sperm Cell
Egg Cell
Nerve Cell
Epithelium Cell
Root Hair Cell
Red Blood Cell
The red blood cell of our blood comes from the millions of red
blood cells which it contains. They carry oxygen from the air
In the lungs to all the body cells. The body needs a lot of
oxygen so the red blood cell has no nucleus. This gives it
space to carry as much oxygen as possible.
Nerve Cell
Nerve cell carry messages around your body. Example, if you
want o move your hand, your brain sends a message through
a nerve cell to your hand telling it to move. Nerve cells are
very long so they can carry messages a long way. They are
also branched at the ends to pick up and deliver messages
from places to places
Epithelium Cells
These cover and protect the surface of organs. They are
Usually flat and fit together in sheets to cover the organs
properly.
Root Hair Cell
You can see these on the roots of plants. Since they are very
long and thin, they can take in a lot of water from the soil.