Body Systems Organization

8/8/2019 Body Systems Organization

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Levels of Organization

Mrs. McCabe

04/08Adapted from Joe Krupens, Standley Middle School


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Division of Labor &

The First Level

Within multi-cellular organisms there is division of labor.

Division of labor means that the work (labor) of keeping the

organism alive is divided (division) among the different partsof 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.

The arrangement of specialized parts within a living thing issometimes referred to as levels of organization. Cells of course,

are the first level of organization.


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

Nerve Cells Skin Cells


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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 tissueinclude 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. Cells that

are similar in structure and function are usually joined

together to form tissues. Tissues are the second level of

organization.


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Lets 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.


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Taken One At A Time.

Connective tissue connectsand supports parts of the

body. Blood, fat, ligaments,

cartilage, bones, and

tendons are all connective

tissues.

Nerve tissue carries messagesback and forth between the

brain and every other part of

the body. The brain, spinal

cord, and nerves are made up

of nerve tissue.

Epithelial tissue covers and lines

the surfaces of your body and

organs, inside and out. Theyprimarily serve as protective

barriers. Skin is one example.

Muscle tissue can contract, or

shorten. Because of this,

muscle tissue makes parts ofyour body move.


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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????


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Level Four: Organ Systems

Each organ in your body ispart of an organ system, a

group of organs that work

together to perform a major

function.

For example, yourheart is

part of your circulatory

system, which carries oxygen

and other materialsthroughout your body.

Besides the heart, blood

vessels are organs that work

in your circulatory system.


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The nervous system detects and

interprets information from the

environment outside the body and

from within the body; controlsmost body functions.

The immune system fights

disease.

The excretory system removes

wastes.

The endocrine system

controls many body processes

by means of chemicals, like

hormones.


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The muscular system enables thebody to move; moves food

through the digestive system, and

keeps the heart beating.

The skeletal system supports and

protects the body, and works with

the muscular system to allow

movement; makes and storesblood cells and stores some other

materials.


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The digestive system takes food

into the body, breaks the fooddown into smaller particles, and

absorbs the digested materials.

The respiratory system takes

oxygen into the body and

eliminates carbon dioxide.

The reproductive system

produces sex cells that canunite with other sex cells to

create offspring; controls male

and female characteristics.


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Lets Review. 1st Level: Cells working together form

4th Level: Organ Systems, which worktogether to form

2nd

Level: Tissues, which can form

3rd Level: Organs, which work together to

form

5th Level: Organisms!

Body Systems Organization

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