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-
In a system that is in dynamic equilibrium, parts of the system change,
but the overall system remains the same.
- Your body is an example of dynamic equilibrium. The following are systems that help maintain this equilibrium:
Excretory
Endocrine
Nervous:
Autonomic, Central
Circulatory
Digestive
Skeletal
Stimulus à
receptor à
regulatory centre à
effector à
responses
^
l
l-------------- feedback
-------------
-
Homeostasis refers to the body’s attempt to adjust to a fluctuating
external environment.
-
All homeostatic control systems have three functional components: a
monitor, a coordinating center, and a regulator.
-
Negative feedback mechanisms trigger a response that reverses the
changed condition.
-
Positive feedback systems move the controlled variable even further away
from a steady state.
Stimulus |
Physiological
Response |
Adjustment |
|
Decreased environmental temperature |
-
Constriction of blood vessels in skin -
Hairs on body erect -
Shivering |
-
Heat is conserved -
More heat is generated by increased metabolism |
|
Increased environmental temperature |
-
Dilation of blood vessels of skin -
Sweating |
-
Heat is dissipated |
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