1. Tissues and Organs
Section 15-1

2. 5 Levels of Organization
A single cell
Tissues
Organs
Organ Systems
Organism

3. Tissues
A tissue is a group of similar cells that perform the same function.
There are 4 basic types of tissue in the human body
Muscle
Connective
Nerve
Epithelial

4. Muscle Tissue
The only kind of tissue in your body that has the ability to contract or shorten
Photo in public domain:

5. Muscle Tissue Three types of muscle tissue have different jobs
Pulls on bones allowing you to move (skeletal)
Lines the walls of structures in your body and does things like move food through your digestive track (smooth)
Pumps blood (cardiac)

6. Connective Tissue
Provides support for your body and connects all its parts
Includes:
Tendons, cartilage and ligaments
Bones
Blood
Fat
Photos in public domain

7. Nerve Tissue
Carries messages back and forth between the brain and spinal cord and every other part of your body
Messages can move at up to 100 meters per second (about 1/3 the speed of sound)
Photo from BrainMaps.org
The Brain contains about 1 trillion neurons – the cells that make up nerve tissue.

8. Epithelial Tissue
Forms a protective surface on the outside of your body
Lines the cavities of the mouth, throat, ears, stomach and other body parts.
Forms the covering or lining of all internal and external body surfaces

9. Functions of Epithelial Tissue
Protection
Sensation
Secretion
Absorption
Excretion
Diffusion
Cleaning
Reduces Friction

10. Forms of Epithelial Tissue
Diagram in public domain:

11. A group of different tissues that has a specific function Examples:
Organs
A group of different tissues that has a specific function
Examples:

12. Groups of organs working together Examples:
Organ Systems
Groups of organs working together
Examples: