2.  The human body is made of trillions of animal cells  The body is organized: Cells--tissues--organs--organ systems--organism

3.  Basic unit of life- makes up all living things  Smallest living part of our body that perform functions  Cannot live alone- they depend on all other cells in the body to function properly  Example: blood cell  Red blood cell carries oxygen from the lungs throughout the rest of the body

4.  A group of similar cells that work together to perform a function  Similar to a brick wall (individual bricks are the cells but put together they make a wall)  Four types of tissues:  Epithelial  Nerve  Muscle  Connective

5.  Made up of two or more tissues that carry out a particular function in the body.  Examples: Heart, skin, lungs, stomach, kidneys, brain, etc.

6.  Group of similar organs put together to perform a specific function and to keep the body energized and living.  Examples: circulatory system, nervous system, endocrine system, respiratory system, integumentary system

7.  Ability to maintain internal conditions in the body to function properly.  Homeostasis=Balance!  Body is always striving to reach this!