Maintaining Life & Homeostasis Notes

Necessary Life Functions MAINTAINING BOUNDARIES – inside stays distinct from outside MOVEMENT – change in body position & transport material inside body RESPONSIVENESS – ability to sense change in environment & react

DIGESTION – process of breaking down ingested food METABOLISM – sum of all chemical reactions occurring in body EXCRETION – process of removing waste

REPRODUCTION – producing offspring GROWTH – increase in size

Survival Needs NUTRIENTS – contains chemicals for energy OXYGEN – needed to release energy WATER – required for metabolism; stable body temperature

STABLE BODY TEMPERATURE - needed for metabolism ATMOSPHERIC PRESSURE – force exerted by weight of air; allows for exchange of gases

Homeostasis body’s ability to maintain relative stable internal conditions HOMEOSTATIC IMBALANCE – inability to maintain homeostasis; cause of illness, disease, or aging

Homeostasis Control Mechanism (Feedback Loop) RECEPTER – sensor that detects change; relays information to control center CONTROL CENTER – determines set point; analyze information received by receptor, then determines appropriate response

EFFECTOR – receive information from control center & produce a response 2 Types: NEGATIVE FEEDBACK MECHANISM - decrease original stimulus

POSITIVE – increase original stimulus