Levels of Organization

• What do you think the 5 Levels of

Organization are in the body??

• Brainstorm with your group and write down

what you think are the 5 Levels – Pick a

recorder.

Levels of Organization:The arrangement of specialized

parts within a living thing.

The labor (work) is divided

among 5 different levels.

What is Division of Labor??

Division of Labor

Within multi-cellular organisms there is

Division of labor.

Division of labor - the work (labor) of keeping

the organism alive is divided (division) among

the different parts of the body.

Each part has a job to do and as each part does

its special job, it works in harmony with all the

other parts.

1st Level - Cells

• Cells are the basic

unit of living

things.

• They are very

diverse and all parts

of the cell perform

specific functions.

Plant Cell

Animal Cell

Cells: LOTS of Different Kinds!Here are two examples. Can you guess what kind?

Nerve Cells Skin Cells

Second Level: Tissues

There are four basic/major types of tissues in the human body:

Muscle tissue, nerve tissue, connective tissue, and epithelial

tissue. (There are other kinds of tissues besides these.) Other kinds of tissue

include bone tissue (a strong solid tissue that gives you shape and support)

made of bone cells in your body form bone tissue. Blood cells in your body are

part of blood tissue, a liquid tissue responsible for transporting food and

oxygen throughout the body.

In any multi-cellular organism, cells rarely work alone.

Tissues are the second level

Tissues are Cells that are similar in structure and function and

are usually joined together to form tissues.

Let’s Look Again…

Here are the cells we saw before, but if you look closely, you can

see that they all look similar. Nerve cells working together make

nerve tissue, and skin cells make up a special type of epithelial

tissue.

Taken One At A Time….Connective tissue connects

& supports parts of the

body- examples: Blood, fat,

ligaments, cartilage, bones,

tendons

Nerve tissue carries messages

back & forth between brain &

other parts of body. Examples:

brain, spinal cord,& nerves

Epithelial tissue covers & lines

body surfaces & organs, inside &

out. Provides a protective barrier.

Example: skin

Muscle tissue contracts, or

shortens - makes parts of your

body move.

Level Three: OrgansWhen a bunch of different types of tissues work together,

they form an organ. There are many organs in the body.

How many can you name??

GET IT????

Level Four: Organ Systems

Each organ in your body is

part of an organ system

organ system, group

organs working together to

perform a major function.

For example, your heart is

part of your circulatory

system, which carries oxygen

& other materials throughout

the body. Besides the heart,

blood vessels are organs that

work in your circulatory

system.

nervous system detects &

interprets info from

environment outside & within

body; controls most body

functions.

immune system: fights

disease.

excretory system: removes

wastes.

endocrine system: controls

body processes by means of

chemicals, like hormones.

Muscular system: enables body

to move; moves food through the

digestive system, and keeps the

heart beating.

Skeletal system: supports and

protects body, and works with

the muscular system to allow

movement; makes and stores

blood cells and stores some other

materials.

Digestive system: takes food

into the body, breaks the food

down into smaller particles, and

absorbs the digested materials.

The respiratory system takes

oxygen into the body and

eliminates carbon dioxide.

Level 5 – Organisms -

All other levels form together to

make organisms

• Entire living things that can carry out all basic life processes.

• Protists

• Plants

• Animals

• Humans

Let’s Review….

• 1st Level: Cells

working together form

• 4th Level: Organ Systems,

which work

together to form

• 2nd Level: Tissues,

which can form• 3rd Level: Organs,

which work

together to form

• 5th Level: Organisms!