Transcript Homeostasis ppt

Homeostasis
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Homeostasis: The ability of the body to
stay with in certain temperature and
chemical(ph) range
Set Point: the average value with in a
given range
Dynamic Equilibrium: The fluctuation of
the system with in a given range
Negative Feedback, Stability
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Most common in body, checks & balance
Positive Feedback, Rapid change
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Very rare in the body, due to rapid change
can cause death or disability quickly
Positive feedback is frequently a
normal way of producing rapid change.
However, positive feedback can be
harmful to the body. For example, if the
body temperature rises above 104o F a
dangerous positive feedback loop may
be created. This high temperature will
increase the metabolic rate, thus
producing heat faster than the body
can get rid of it. Thus, temperature
rises still further, increasing metabolic
rate and heat production even more.
This becomes fatal at approximately
113o F.