Body Systems
Overview
1. cell membrane - the
thin outer covering of a
cell; holds the cell
together
2. nucleus – the small
central core in almost
every cell; stores
information and directs
all the activities of the
cell.
3. cytoplasm – the
material between the
cell membrane and the
nucleus; made up of
many parts that help
the cell work
4. cell – is the basic unit of all living things
5. tissue – a group of cells that are alike and
work together to do the same job.
6. organ – a body part made up of various
tissues; does a certain job in the body.
7. body system – a group of organs that work
together to do a certain job.
1. What are your cells?
– a. Everything in your body is made of
cells
– b. Different cells have different shapes
and do different jobs
– c. Almost all have the
same 3 parts
i. Cell membrane – thin
outer covering that holds
the cell together, lets in
water and everything else
the cell needs, keeps out
most things that could
harm the cell
ii. Nucleus – small center
that stores information and
directs all the activities of
the cell, “brain”, sends
messages
iii. Cytoplasm – material
that is between the nucleus
and cell membrane. Made
up of parts that help the
cell work.
2. What are your tissues?
– a. Tissue – a group of cells, ex:
muscles, blood, skin, hair, bone
i. Each does a different job and are
specially formed for the work they do “function”
ii. EX: bone cells are hard and cannot
bend, skin cells are flat and thin and fit
tightly together at the edges
3. What are your
organs?
– a. Tissues work
together to make up
organs
– b. Each organ does a
specific job to help you
stay alive and healthy
– c. EX: heart is an
organ that pumps the
blood, eyes are organs
that help you see
4. What are your body systems?
– d. some organs are part of more than
one system
– e. systems work together to make sure
that the body maintains homeostasis – is
the condition in which the body’s internal
conditions are at a stable state
Body Systems Worksheets
Review
What are the three main parts of a
cell?
What are the three jobs of a cell
membrane?
How do cells, tissues and organs
work together in the body?
How can a problem in one body
system affect another body system?