1. How is the body organized?
Each part of the body has a specific job to do.
The levels of organization in the human body consists of……
Cells
Tissues
Organs
Organ Systems
Organism

2. Cells

3. Cells
Cells are the basic units of structure and function in a living thing.
Cells are the smallest units in the body.
The human body contains about 100 trillion cells.

4. What are Cells made up of?
Cells are made up of a
Cell Membrane
Nucleus
Cytoplasm

5. Cell Membrane The cell membrane forms the outside boundary of a cell.
Cell wall

6. Nucleus The nucleus is the control center of the cell.
The nucleus directs the cells activities.
The nucleus contains information that determines the cell’s characteristics.

7. Cytoplasm Cytoplasm is the area between the cell membrane and nucleus.
The cytoplasm contains a clear, jellylike substance.

8. What are Cells made up of?
Review Cells:
What is a cell?
A cell is the basic unit of structure and function in a living thing and the smallest unit in the body.
What are Cells made up of?
Cell Membrane - the outside boundary of a cell.
Nucleus - the control center of the cell, directs the cells activities and determines the cell’s characteristics.
Cytoplasm - the area between the cell membrane and nucleus.

9. Tissue

10. Tissue
A tissue is a group of similar cells that perform the same function.
The human body contains four basic types of tissue.
Muscle Tissue
Nerve Tissue
Connective Tissue
Epithelial Tissue

11. Muscle Tissue

12. Muscle Tissue
Muscle tissue can contract to make parts of your body move.

13. Nerve Tissue

14. Nerve Tissue
Nerve tissue carries messages back and forth between the brain and every part of your body.
Your brain is made up of mostly nerve tissue.

15. Connective Tissue

16. Connective Tissue
Connective tissue provides support for your body and connects all its parts.
Examples of connective tissue
Bones
Fat
Blood
Cartilage
Tendons

17. Epithelial Tissue

18. Epithelial Tissue
Epithelial tissue covers the surfaces of your body, inside and out.
Lines the inside of different organs
Your skin is one type of epithelial tissue.
There are different types:
a. Squamous – skin, esophagus
b. Columnar – Lungs, bladder

19. Review Tissues

20. Organs and Organ Systems
An organ is a structure that is made up of different kinds of tissues.
Like tissues, an organ performs a specific job. Each organ in your body is part of an organ system.

21. Organ Systems
An organ system is a group of organs that work together to perform a major function.
The body has 11 organ systems.
They are……..(pg 21)

22. Organ systems
Circulatory system - carries needed materials to the body cells: carries wastes away from body cells; helps fight disease.
Digestive system- takes food into the body; breaks down food and absorbs digested materials.

23. Organ systems Endocrine system- controls body processes chemically.
Excretory system – removes waste from the body.

24. Organ systems Immune system- fights disease.
Muscular system– enables the body to move; moves food through the digestive system and keeps the heart beating.

25. Organ systems
Nervous System- detects and interprets information from outside the body; controls most body functions.
Reproductive system– produces sex cells to create offspring; controls male and female characteristics.

26. Organ systems
Respiratory system- takes oxygen to the body and eliminates carbon dioxide.
Skeletal system– supports and protects the body; works with muscles to allow movement; makes blood cells.

27. Organ systems Skin- Supports and protects the body;
Helps regulate body temperature.
(goose bumps)

28. Review Questions 1. What is the smallest level of BODY organization?
Answer: Cell
2. What is the most complex level of BODY organization?
Answer: Organism/YOU
3. What are the 5 levels of BODY organization?
Answer: Cell Tissue Organs Organ Systems Organism
4. What is tissue?
Answer: A tissue is a group of similar cells that perform the same
function
5. What are the 4 types of tissues?
Answer: Muscle Tissue Nerve Tissue
Connective Tissue Epithelial Tissue
6. What is the job of muscle tissue
Answer: Can contract to make parts of your body move.

29. 7. What is the job of the nerve tissue?
Answer: Carries messages back and forth between the brain
and every part of your body.
8. What is your brain made of?
Answer: Nerve tissue
9. Which tissue provides support for your body and connects all its parts?
Answer: Connective Tissue
10. Name types of connective tissue?
Answer: Bones Fat Blood Cartilage Tendons

30. 11. Where is epithelial tissue found?
Answer: Skin Stomach Bladder Esophagus
12. Describe what is an Organ?
Answer: A structure that is made up of different kinds of tissues
working together
Example: Heart Lungs Liver Small Intestine
13. What is an Organ System?
Answer: Group of organs that work together to perform
a major function.
14. Name the 11 Organ systems:
Answer: Respiratory Circulatory Digestive Excretory Skin
Skeletal Muscular Nervous Reproductive
Immune Endocrine

31. 15. Briefly explain each System:
a. Respiratory - Takes in O2 and removes CO2
b. Circulatory – Carries materials, removes waste,
fights diseases
c. Digestive – Breaks down and absorbs food
d. Excretory – removes waste from body
e. Skin - protects body from outside invaders
f. Skeletal - supports, protects, stores, makes blood cells
g. Muscular – movement, moves food, heart beat
h. Nervous – Detects, interprets info, controls body functions
i. Reproductive – produces sex cells, creates offspring
j. Immune – Fights diseases, infections, Cancer
k. Endocrine – Controls chemical processes