Define homeostasis and the three components of homeostatic regulation.
Homeostasis
A condition in which the body's internal environment remains steady despite changes inside and outside the body
Stimulus
Any disruption that causes a change in the controlled condition. Any disruption can be caused by an external environment, internal environment, or social environment.
control center
Center-ranges in which a controlled condition should be maintained, then generates output commands.
Positive Feedback
childbirth
a feedback system
System is a cycle of events in which the status of a body condition is continually monitored, evaluated, changed, re-monitored, and re-evaluated, and so on.
Positive feedback
amplify and reinforce a change brought on by the stimulus; not typically used for homeostasis.
Positive Feedback
ex. Accumulation of platelets after an injury results in blood clotting
Negative Feedback
ex. Regulation of body temperature
Homeostatic imbalance
failure to maintain homeostasis-results in illness, disease, or even death
feedback systems
homeostasis is maintained by many of these
Homeostatic control
maintains normal range rather than absolute value, or set point.
receptor
monitor changes, by nerve impulses, in a controlled condition and sends info to the control center.
Negatve Feedback
provides stability
Effectors
receives output from the control center and produces a response that changes the controlled condition.
Negative feedback
regulates blood glucose levels
Negative Feedback
shuts off or reduces the original stimulus
Negative Feedback
the output shuts off the original stimulus or reduces intensity
receptor, control center, effectors
three componenets of a feedback system
Positive feedback to negative feedback
when giving birth, you go from this to this
Positive Feedback
accelerates or enhances the output
