Homeostasis - functions/feedback loops

a&p 1 basics

Homeostasis

The ability to maintain relatively stable internal conditions even though the outside world changes continuously

Variable

the factor or event regulated

Receptor

detects fluctuations in the variable

Control Center

determines the normal range for the variable
analyzes input & determines response

Effector

provides the response

Negative Feedback Loop

When a variable fluctuates from the normal range, negative feedback mechanisms resist the change and reverse it back towards the normal

Poisitive Feedback Loop

When a variable deviates from the normal, a positive feedback mechanism will enhance or exaggerate the stimulus

P.F.L Examples

Blood Clotting, Childbirth, Contractions

N.F.L Examples

Control of… Blood Pressure, Body Temp., Blood Glucose