Download Organization of the Body

Organization of the Body
Organization of the Body
Levels of Organization
There are five levels of
organization found in living
things.
Mouth
Liver
Esophagus
Stomach
1. Cells
2. Tissues
Small
intestine
Large
intestine
3. Organs
4. Organ systems
5. Organisms
The Digestive System
Organization of the Body
Cells
You learned in the last unit that
cells are the basic unit of life.
Although some living things
exist as a single cell, most
living things are made of many
cells, and those cells combine
to form different parts that
have different jobs in a living
thing.
Organization of the Body
Tissues
Tissues are a group of cells
that work together to perform a
similar function (job).
Blood, bones and your nerves
are examples of tissues.
There are four types of tissue:
1. Connective
2. Epithelial
3. Muscle
4. Nerve.
Skeletal muscle tissue from Jagiellonian
University Medical College retrieved from
Wikimedia on 11/27/09.
Organization of the Body
Organs
Organs are made of a group of tissues and have a
specific job to do in the body. Examples of organs are
stomach, heart, brain, intestines, liver, and kidneys.
Kidney
Liver
Heart
Organization of the Body
Organ Systems
Organ systems are a group of organs that
work together to perform a specific function
in the body.
There are ten organ systems in the human
body:
1. Circulatory
6. Nervous
2. Respiratory
7. Excretory
3. Digestive
8. Immune
4. Skeletal
9. Reproductive
5. Muscular
10. Endocrine
The digestive system
Organization of the Body
Organisms
An organism is a living thing. Organisms are able to take
in food, release wastes, reproduce, grow, and respond
to the environment.
Some organisms are made of only one cell like bacteria
and protists.
Other organisms are
made of many organ
systems like plants,
fungi, and animals.