1. MAINTAINING LIFE
Survival Needs

3. Survival Needs Nutrients
Food contains chemicals used for energy and cell building
Proteins and fats essential
Minerals and vitamins for cell functions and oxygen transport in blood

4. Survival Needs
Oxygen
Chemical reactions that release energy require oxygen
Respiratory and cardiovascular system

5. Survival Needs Water Accounts for 60-80% of body weight
Obtained from ingested foods and liquids

6. Survival Needs Body Temperature 37 degrees C (98 degrees F)
When too low metabolic reactions slow and can stop
When too high chemical reactions happen too quickly leading breakdown of proteins

7. Survival Needs Atmospheric Pressure
Breathing and exchange of CO2 and O2 in the lungs