*Two branches of science that deal with body’s parts and function
a)Anatomy :
-The science of body structures and relationships
- First studies by dissection (cutting apart)
-Imaging techniques
b)Physiology
-The science of body functions

*Homeostasis
-A condition of equilibrium (balance) in the body’s internal environment
-Dynamic condition
-Narrow range is compatible with maintaining life
Example:
-blood glucose levels range between 70 and 110 mg of glucose/dL of blood
-Whole body contributes to maintain the internal environment within normal limits

Maintaining the volume and composition of body fluids are important

+Body fluids are defined as dilute, watery solutions containing dissolved chemicals inside or outside of the cell

+ Intracellular Fluid (ICF)
- Fluid within cells

+ Extracellular Fluid (ECF)
-Fluid outside cells
-Interstitial fluid is ECF between cells and tissues