Homeostasis Flashcards
Homeostasis
regulation of the internal bodily environment at or near a stable level **requires a lot of energy, very important for the function of enzymes & proteins
Negative Feedback
returns variable back to normal set point/range
Set point
where the body functions best
Endotherms
generate heat inside the body though metabolic processes
Ectotherms
use the environment to heat up
Homeotherms
have to keep their body at a constant temperature (ENDOTHERMS)
Heterotherms
can vary in temperature (ECTOTHERMS)
Thermogenesis
the process of generating heat
Diurnal Rhythm
bio processes that occur in daily cycles resulting in temperature fluctuations
Core temperature
monitored by the hypothalamus through thermoreceptors
Skin Temperature
controlled by peripheral thermoreceptors in the skin
Vasodilation
blood vessels dilate to to dissipate heat; activated by beta adrenoreceptors
Vasoconstriction
blood vessels constrict to conserve body heat; activated by alpha adrenoreceptors
Positive feedback
-enhances output created by stimulus
-short term
-moves variable away from the set point, amplifies the difference between actual level & set point
Goiter
irregular growth of the thyroid gland (disruption of normal feedback)
Feed forward
anticipatory mechanisms that happen when a signal is changed at an early stage, therefore the pathways of the body prepares for future states based on initial stimulus
Alpha adrenoreceptors
associated with the fight or flight response; responsible for vasoconstriction, contraction of smooth muscle
Beta adrenoreceptors
secondary response to the fight or flight system; responsible for vasodilation and increasing heart rate, relaxation of smooth muscle
