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Homeostasis (a Greek term meaning same
state), is the maintenance of constant
conditions in the internal environment of the
body despite large swings in the external
Functions such as blood pressure, body
temperature, respiration rate, and blood
glucose levels are maintained within a range of
normal values around a set point despite
constantly changing external conditions.
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What is Homeostasis?
Refers to a state of constancy in a system.
In its normal, or resting, state, a system often is said
to be in homeostasis.
When events occur that disrupt the normal state, the system is
able to respond and restore homeostasis.
Physiologists use the term homeostasis to refer to
maintaining a constant internal environment.
A homeostatic system makes adjustments to lessen the
internal impact of major external disturbances.
Example: During exercise, sweating increases to
maintain a constant internal temperature.
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Organism's Internal Regulation
Examples of physiological conditions requiring homeostasis:
Concentration of Waste Products
Gas Exchange
Energy Requirements
Water/Ion balance
"Regulators" use behavioral and physiological mechanisms to
buffer external changes and thus, maintain a constant internal
"Conformers" adjust the internal environment in reaction to
external changes.
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