Organization In The Body

How do we sort it all out?

The body is wonderful

thing…

But how do we organize it?

Because we are multicellular

organisms it’s very complex.

What is the body fundamentally made of?

?

Cells

We can study the body at the cellular level.

Cells are the first level of organization.

Cells carry out their own “tasks” to ensure that the body as a whole continues to function

In multicellular organisms, cells rarely work alone.

Cells that are similar in structure and function are usually joined

together to form tissues.

Tissue is the second level of organization.

TissuesThere are four

basic/major types of tissue in the human body:

• Epithelial tissue• Muscle tissue• Connective tissue• Nerve tissue

Epithelial Tissue

This tissue covers and lines body surfaces, cavities and ducts. It can be recognized by the collections of regular, geometric shaped cells with prominent nuclei.

Muscle Tissue

Tightens and loosens itself to move other body parts

Connective Tissue

Connects and supports other parts of the body.

Blood, bone, fat and cartilage are all examples of connective tissue.

Nerve Tissue

Carries messages back and forth between the brain and the rest of the body

When a group of different types of tissue work together, they form an organ.

Organs are the third level of organization.

Here, several different types of tissue have separate jobs, but they all form one larger

structure – an organ.

Organs

Just as cells act together in tissues, and tissues act together in organs, organs act together in organ systems.

Organ systems are the fourth level of organization.

Organ Systems

Each organ in your body is part of an organ system, a group of organs that work together to perform a major function.

Organ Systems

All of the organ systems come together to form an organism.

Organism is the fifth level of organization.

Let’s review:

1st Level: Cells working together form

2nd Level: Tissues, which can form

3rd Level: Organs, which work together to form

4th Level: Organ Systems, which work together to form

5th Level: Organisms!

There’s also one more level:

Scientists are learning about how cells work by studying the chemical reactions that go on inside cells. This is

the job of biochemists. They study the body at the

biochemical level.