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neuro ch 13
terms
13
Other
Not Applicable
12/16/2005

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Term
summing point or comparator
Definition
where the output in a circuit is combined with the input in a feedback cercuit
Term
system acting as a controller
Definition
intention is to vary the input signal and modulate the output (ex moving a video camera)
Term
regulator
Definition
compares actual input with desired input and adjusts output to fix the input
Term
set-point
Definition
reference input signal that the actual input is compared to
Term
closed lop gain
Definition
G/(1+G)
Term
open loop gain
Definition
G
Term
poikilotherms
Definition
adjust body temperature by moving to warmer or colder environment
Term
homeotherms
Definition
have intrinsic thermoregulatory systems
Term
preoptic reigon of hypothalamus
Definition
where neurons that are particularly sensitive to temperature monitor the temp of the hypothalamus - the controlled variable in temperature regulation
Term
lipostatic hypothesis
Definition
theory that chemical signs derived from the size of the body's fat mass regulate eating patterns
Term
ob gene
Definition
codes for leptin, the protein missing in obese mice
Term
glucostatic hypothesis
Definition
brain uses feeding to monitor blood sugar levels
Term
hyperphagia
Definition
overeating
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