1. Organization of Living Things

2. Living things are organized…
Cells are organized into tissues,
Tissues are organized into organs
Organs work together to form organ systems
Organ systems are vital to a healthy organism

3. What is an organism?
An organism is a body made up of organs, organelles, or a combination of both, that work together to carry on the various processes of life

4. Cells Cells make up the structure of an organism
Some organisms are unicellular. They are made of only one cell.
Other organisms are multi-cellular. They are made of many cells.
Multi-cellular organisms contain many types of cells; each cell performs a specific task to maintain the life of the organism.

5. Tissues
Tissues are groups of similar cells acting together to perform specific functions in the body of an organism

6. Epithelial Tissue
The cells of this tissue pack tightly together to form sheets of tissue
These “sheets” serve as membranes lining organs to keep the body’s organs separate, in place, and protected
Examples include the outer layer of the skin, the inside of the mouth and stomach, and tissue surrounding the body’s organs

7. Connective Tissue This tissue adds support and structure to the body
Most connective tissue contain a long, stringy protein called collagen that makes this tissue strong
Some examples include the inner layers of skin, tendons, ligaments, cartilage, bone and fat tissue
Blood is also considered a connective tissue

8. Muscle Tissue This is a special tissue that can contract (bunch up)
Muscle tissue contains two special proteins called actin and myosin that slide past one another and allow movement
Examples of muscle tissue are contained in the muscles throughout your body

9. Nerve Tissue
Nerve tissue has the ability to generate and conduct electrical signals in the body
These electrical messages are managed by nerve tissue in the brain and transmitted down the spinal cord to the body.

10. Organs
Organs are specialized parts of an organism that perform a specific function
Organs contain at least two different types of tissue working together for a common purpose
Examples include the heart, brain, kidneys, liver, and even the skin (which is the body’s largest organ!)

11. Organ Systems
Organ systems are groups of organs that work together to accomplish a specific task within the organism
There are 10 major organ systems in the human body:

12. Skeletal System Provides support for the body
Protects delicate internal organs
Provides attachment sites for the organs
Major Parts:
Bones
Cartilage
Tendons
Ligaments

13. Skeletal System

14. Muscular System The main role is to provide movement
This includes the movement of limbs for mobility and
The movement of materials through organs, such as the stomach and intestine
Major Parts:
Skeletal Muscles
Smooth muscles
(found throughout the body)

15. Muscular System

16. Integumentary System
Guard the body’s physical and biochemical integrity
Maintain a constant body temperature
Provide sensory information about the surrounding
environment.
4. Largest organ system

17. Reflection Question Name the body systems that work together.
Why do you think it is important that these organ systems work together?