Two types of homeostasis are usually distinguishedphysiological
and developmentalalthough intermediate conditions exist.
Physiological homeostatic reactions enable organisms to maintain
certain physiological steady state in spite of environmental fluctuations.
The regulation of the concentration of salt in blood by the kidneys,
or the hypertrophy of muscle owing to strenuous use, are examples
of physiological homeostasis. Developmental homeostasis refers
to the regulation of the different paths that an organism may
follow in the progression from fertilized egg to adult. The process
can be influenced by the environment in various ways, but the
characteristics of the adult individual, at least within a certain
range, are largely predetermined in the fertilized
To return to the previous topic,
click on your browser's 'Back' button.