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Biology Ch.9.1 Terms

Homeostasis and Circulation

Homeostasis "Steady state". The body's maintenance of a relatively stable internal environment despite a changing external environment.
Dynamic Equilibrium State of balance achieved within an environment as the result of internal control mechanisms that continuously oppose forces that tend to change that environment.
Homeotherms (___=same, _____=temperature). These organisms keep their body temperature relatively constant. (Eg. birds and mammals)
Poikilotherms Animals whose body temperature fluctuates depending on the temperature of their environment. (Eg. cold-blooded animals like turtles, lizards, snakes)
Vasoconstriction The constriction of blood vessels.
Vasodilation The dilation of blood vessels.
Negative Feedback Loop The body's reaction to increased or decreased temperature. A process that detects and reverses deviations from normal body temperature or other constants. Essential to maintain homeostasis.
Positive Feedback Loop Rare in healthy bodies. Acts to move a system away from balance and stability. Usually associated with disease or change.
Created by: Inkina
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