Download Building blocks of life

Building blocks
of life
Lesson 2: year 7 life processes
Living things are made up of tiny building blocks
called cells.
Each cell respires, takes in food, gets rid of
wastes, grows, reproduces and dies.
A living thing can be just one cell or
millions of cells.
Big living things don’t have bigger cells
they just have more cells.
Amazingly, the human body has more than
10,000,000,000,000 (that’s 10 million million) cells!
Think about the size of your little toe.
It has about 2 or 3 thousand million cells!
That’s a lot of cells to make one toe,
so cells must be very, very, very small.
How do we know about cells if they are so small?
Every living thing – from an elephant to an ant,
from a tree to a daisy, from your left toe to
right earlobe – is made of cells.
Microscopes allow us to magnify cells revealing
their shape and structure.
This is a typical animal cell.
Do animal and plant cells look the same?
Compare a typical animal cell and a typical plant cell.
Which parts of a plant cell are the same as an animal cell?
Which parts of a plant cell are not found in an animal cell?
What could you do if you were one cell?
Not much! You’d be a blob, with lots of pieces floating
around inside of you!
Keeping you alive is a big job. So your body is made
of millions of cells that have to be very organised.
Your body has organs that each carry out specific
jobs to keep you alive.
How many organs can you name?
Identify the organs
labelled in the
eye
diagram.
skin
brain
ear
tongue
heart
lung
stomach
intestines
muscle
Similar
Cells
are
cells
the that
building
do the
blocks
sameofjob
all
livingtogether
organisms.
to
Different
tissues
work
together
to work
make
an organ.
make tissue.
muscle cell
stomach
Different cells do different
jobs.
muscle
tissue
How
do tissue,
the millions
cells and
in your
body
workmake
together?
Muscle
nerveoftissue
blood
tissue
Muscle
cells make muscle tissue.
up the stomach.
What
type
of cells
are nerve
tissue
and blood
tissue
Organs
work
together
to make
an organ
system.
made from?
What organ system is the stomach part of?
Name a cell that
would be suitable
for each job.