Transcript Cells 2

Lets take a look at typical animal cells
Animal Cells
Cytoplasm
Nucleus
Membrane
Animal Cell
These join together to form different
parts of the body.
When cells join together they form tissues.
There are muscle and nerve tissues. They
have different functions.
This is some
muscle tissue
taken from the
human heart.
When tissues join together they form organs.
The heart is an organ.
Another example of an organ is the lung.
This is an airway
in the lung.
So what are the lungs there for?
The Lungs deliver
oxygen to the blood.
The blood takes the
oxygen to the
muscles.
Oxygen is turned into
energy.
Another example of an organ is the lung.
When we breath
in air travels
down our
airways.
These airways
contain epithelial
cells, which have
tiny hairs to trap
dirt and dust.
The cells line the
airways.
Diagram of epithelial cells
Epithelia
Nucleus
Membrane
Cytoplasm
So oxygen ends up in the blood…
Lets have a look at some blood cells. I hope no ones
squeamish!
Do you notice the
lack of a nucleus?
That shadow in the
middle of the cell is
NOT a nucleus!
The cell has a curved
shape.
But does something
look wrong with this
picture!???
Red blood cells:
Ahh that’s better!
Red blood cells:
Red blood cells have
their characteristic
red colour because of
a chemical called
haemoglobin.
It is red in colour and
is very good at
combining with
oxygen molecules.
White blood cells:
White blood cells are
not white (they are
actually colourless!).
They fight disease in
the body.
White blood cells:
Notice the strange
shape of the
nucleus?
It is almost in two
completely separate
parts.
There are different
types of white blood
cells.
White blood cells:
There are not as
many white blood
cells as red blood
cells.
Here are some more
pictures.
White blood cells:
There is about one
white blood cell to
every one hundred
red blood cells.
White blood cells:
We can only see the
nucleus and cell in
these pictures
because they have
been stained with a
purple dye.
Now one reason we are here...
So what are they?
When an egg cell meets with a sperm cell,
fertilisation takes place.
Egg cell
Sperm Cell
When an egg cell meets with a sperm cell,
fertilisation takes place.
Okay, so they don’t look like much!
But they are responsible for you.
It takes only one
sperm and one
egg.
Each sperm is in
fierce
competition to
fertilise the egg.
Like being the
winner of a
marathon!
So to summarise. ALL of the life on this planet
is made up of CELLS. Cells are alive!
Now some little forms of life you don’t see
every day...
These are single celled organisms. Too small
to see without a powerful microscope
These are single celled organisms. Too small
to see without a powerful microscope