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What is homeostasis?
· Homeostasis is the maintenance of constant
internal conditions, such as temperature, pH,
water potential and blood glucose
concentration
· Homeostasis ensures that the cells of a body
are in an environment that meets their needs
and allows them to function normally despite
external changes…read more

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Control mechanisms…read more

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Principles of negative feedback
· Negative feedback: Negative feedback means
that whenever a change occurs in a system,
the change automatically causes a corrective
mechanism to start, which reverses the
original change and brings the system back to
normal. It also means that the bigger then
change the bigger the corrective mechanism.…read more

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Negative feedback continued
Negative feedback is a natural mechanism the body employs in an attempt to keep
the body's conditions close to the body's set point. When the body senses a
change away from it's normal set point, the body engages mechanisms to help
reverse or counteract these changes.…read more

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Principles of positive feedback
· Positive feedback occurs when the change
stimulates a further change in the same
direction. Positive feedback is potentially
dangerous and is usually associated with a
breakdown in the normal control mechanism. It
occur when the feedback causes the corrective
measures to be turned on (like in hypothermia,
or in neurones when a stimulus causes a small
influx of sodium ions that increases the
permeability of neurone to ions so more enter)…read more

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