BODY ORGANIZATION & HOMEOSTASISChapter 1 Section 1Pages: 6 - 11

Objectives: Order the levels of organization in the body.

Describe the basic components of a body system & explain how they work together to function as a system.

The levels of organization in the human body consist of…

1. Cell: the basic unit of structure & function in a livingthing.

Cell Membrane: outside boundary of the cell

Nucleus: control center; directs cell activities & contains cell information

Cytoplasm: material in a cell; clear, jellylike substancecontaining cell structures.

Cell Functions: Carry on processes that keep the organism alive – Release energy, grow, get rid of waste,& reproduce.

2. Tissues: A group of similar cells that perform thesame function. The body contains 4 basic types…

*Muscle Tissue: can contract (shorten)

*Nervous Tissue: directs and controls body processes- theycarry electrical messages between the brain and otherbody parts.

*Connective Tissue: provides support for your body and connects all its parts. (bone, blood, and fat for example.

*Epithelial Tissue: covers the surfaces of your body, inside& out. Skin and the lining of your digestive system are examples.

3. Organs: A structure that is composed of different kinds of tissue. An organ performs a complex, specific job. Examples are: Heart, Brain, Kidneys, etc.

4. Organ Systems: A group of organs that work together to perform a major function. Examples are:circulatory system, skeletal system, etc.

Homeostasis: The body’s tendency to keep an internalbalance.

*Homeostasis is the process by which an organism’s internal environment is kept stable in spite of changesin the external environment.

Stress: the reaction of your body and mind to potentiallythreatening, challenging, or disturbing events.

Adrenaline: Gives you a burst of energy and preparesyour body to take action.

Fight or Flight Response: Reaction from adrenaline. It prepares you to either fight the stressor OR run away from the stressor.

Long-Term Stress: Stressor that continue for a long timeExamples:

Short-Term Stress:Examples:

Dealing with Stress:Examples: