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Slide 1

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CONTROL OF INTERNAL CONDITIONS
It is important that the internal environment of the body is controlled. Maintaining a constant internal
environment is called homeostasis. The nervous system and hormones chemical messengers produced in
glands and carried by the blood to specific organs in the body) are responsible for this.
These are some of the internal conditions that are controlled-
Water content of the body
This is controlled to protect cells by avoiding too much water entering or leaving them. Water content is
controlled by water loss from:
· the lungs when we exhale
· the skin by sweating
· the body, in urine produced by the kidney
Ion (salts) content of the body
This is controlled to protect cells by avoiding too
much water entering or leaving them. Ion content
is controlled by loss of ions from:
· the skin by sweating
· the body in urine produced by the kidneys
Temperature of the body
This is controlled to maintain the temperature at
which enzymes proteins which catalyze or
speed up chemical reactions inside our bodies)
work best. Body temperature is controlled by:
· controlling blood flow to the skin
· sweating
· Shivering
Blood sugar levels
This is controlled to provide cells with a
constant supply of energy. Blood sugar level
Is controlled by the release and storage of
glucose controlled by insulin A hormone that
regulates the level of sugar in the blood. It is
produced in the Islets of Langerhans, in the
Pancreas.).…read more

Slide 2

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Too Little
Water
Too Much
Water…read more

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