MAINTAINING LIFE Survival Needs
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
Survival Needs Oxygen Chemical reactions that release energy require oxygen Respiratory and cardiovascular system
Survival Needs Water Accounts for 60-80% of body weight Obtained from ingested foods and liquids
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
Survival Needs Atmospheric Pressure Breathing and exchange of CO2 and O2 in the lungs