1. Bones, Muscles and Skin Chapter 14-1
Human Body
Bones, Muscles and Skin
Chapter 14-1

2. Body Organization and Homeostasis
Key Concepts:
What are the levels of organization in the body
What is homeostasis

3. Vocabulary Cell Cell Membrane Nucleus Cytoplasm Tissue Muscle Tissue
Nervous Tissue
Connective Tissue
Epithelial tissue
Organ
Organ System
Homeostasis
Stress

4. Lunch in the cafeteria
The bell rings you hurry down the hall to the cafeteria
You smell hot pizza, and nachos this makes your mouth water
You get your food and balance your tray
After you pay you look around for your friends
You walk over, sit down, and eat
Think about how many body parts were involved in this simple act of getting and eating your lunch

5. Organization
The levels of organization in the human body consist of cells, tissues, organs and organ systems
Smallest unit of organization-CELL
Next largest unit-TISSUE, then Organs
Largest unit of organization-ORGAN SYSTEM

6. Cells Basic unit of structure and function in a living thing is a cell
The structure of most animal cells/including the human body are cell membrane, nucleus and cytoplasm
The human body is made up of trillions of tiny cells

7. Function of Cells
Cells carry on the processes that keep organisms alive
They release energy for the bodies activities
Grow and reproduce
They get rid of waste products that result from these activities

8. Tissues Group of similar cells that perform the same function
Four basic types of tissue
Muscle
Nervous
Connective
Epithelial

9. Muscle tissue Every movement you make depends on muscle tissue
Muscle tissue can contract

10. Nervous tissue Enables you to see, hear and think
Directs and controls, it carries electrical messages back and forth between the brain and other parts of the body

11. Connective Tissue Connects and supports parts of your body
Bone tissue and fat are connective tissues

12. Epithelial Tissue
Covers the surfaces of your body and lines your internal organs
Some epithelial tissue such as your skin protects the delicate structures that lie beneath it
Digestive system is lined with epithelial tissue which allows you to digest and absorb the nutrients in your food

13. Organs and Organ Systems
What is an example of an organ?
Stomach, heart, brain lungs
An organ is composed of different kinds of tissue and performs a specific job
Each organ is part of an organ system a group of organs that work together to perform a major function

14. Homeostasis
When all the systems work together such as respiratory, digestive and circulatory they are maintaining a process called homeostasis
The process by which an organisms internal environment is kept stable in spite of changes in the external environment

15. Maintaining Homeostasis
Your body has various ways of maintaining homeostasis
When you are too warm you sweat which helps to cool your body
When you are cold you shiver-shivering occurs when your muscles contract and relax rapidly
These processes help maintain homeostasis