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