Standards
1. Cells have a distinct structure that
allows them to have specific jobs.
• 2. Cells that are alike are organized into
tissues.
• 3. Tissues working together form organs.
• 4. Cells, tissues and organs form systems
that serve a specific job for the organism.
Wanted:
1. Cells that want to work
alone and be a one-celled
organism
• You will work alone and perform all
the jobs and activities necessary to
keep yourself alive.
Wanted:
2. Cells that will work with
others and be a part of a multicellular organism
Available Positions
•
Types of positions available: 200
Positions available: Between 5 and 65 trillion.
Cell Jobs Available
• The following slides will show
examples of available cell positions.
You will:
• Have a specific job.
• Be shaped so that you can perform
your job.
Skin Cells…
Requirements
• Mostly flat
• Will need to line up closely with other
skin cells to form a protective layer for the
body.
• Hold in body fluids.
• Keep the body waterproof.
• Keep harmful germs from getting in.
Nerve Cells…
Requirements
• Long and stringlike having many branches
• Quickly receive and deliver messages from
one part of the body to another.
Bone Cells…
Requirements
• You will live surrounded by a hard
substance made of calcium and
phosphorus.
Muscle Cells…
Requirements
• Long with many fibers.
• Be able to contract and relax to cause
movement.
Fat Cells…
Requirements
• You will store fat
• Keep the organism warm.
Tissues
Cells that are alike will work in groups
to form tissues.
• Skin cells will form skin.
• Nerve cells will form nerve tissue.
• Bone cells will form bone tissue.
• Muscle cells will form muscle tissue.
• Fat cells will form fat tissue.
Four Primary Tissue Types
1. epithelial tissue
2. connective tissue
3. muscle tissue
4. nerve tissue
1. Epithelial Tissue
Job:
To line organs and help to keep the body's organs separate,
in place and protected.
Examples:
•outer layer of the skin
•the inside of the mouth and stomach
•tissue surrounding the body's organs
Job:
2. Connective Tissue
To add support and structure to the body.
Examples:
•inner layers of skin
• tendons
• ligaments
• cartilage
• bone
• fat tissue.
• blood
3. Muscle Tissue
JobBe able to:
• contract
• slide past one another
• allow movement
Examples:
All muscles
Job
4. Nerve Tissue –
Be able to:
• generate and conduct electrical signals in the body
• transmit signals from the brain down the spinal cord to
the body
ExamplesAll nerves
Organs
• Different types of tissues work together to form
an organ.
Examples
• Stomach-muscle tissue, nerve tissue, blood tissue.
• Heart- The cells in a natural heart organ are lined
up uniformly so they can beat together and pump
blood. It is currently possible to grow cardiac cells
in a laboratory, but they develop randomly and
beat individually.
• Skin, kidney, liver, bladder, lungs, pancreas, colon,
etc.
Systems
A group of organs will work together to do a certain
•
•
•
•
•
•
•
•
job.
Skeletal
Muscular
Circulatory
Digestive
Reproductive
Excretory
Nervous
Lymphatic/Immune
Skeletal System:
Major Role:
The main role of the
skeletal system is to provide
support for the body, to
protect delicate internal organs
•
and to provide attachment sites
for the organs.
Major Organs:
Bones, cartilage, tendons and ligaments.
Muscular System:
•Major Role:
The main role of the muscular system is to
Provide movement. Muscles work in pairs
to move limbs and provide the organism
with mobility.
•Muscles also control the movement of
materials through some organs, such as the
stomach and intestine, heart and circulatory
system.
Major Organs:
Skeletal muscles and smooth
muscles throughout the body.
Circulatory System:
•Major Role:
The main role of the circulatory
•system is to transport nutrients,
gases (such as oxygen and CO2),
hormones and wastes through the
body.
•Major Organs:
Heart, blood vessels and blood.
Digestive System:
Major Role:
The main role of the
•digestive system
• is to breakdown and
•absorb nutrients
•that are necessary for
• growth and maintenance.
Major Organs:
Mouth, esophagus, stomach, small and large intestines.