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Slide 1

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Homeostasis
Homeostasis-the processes in your Carbon dioxide is a waste
body that help to maintain a product of respiration, it
constant internal environment. is excreted through the
Some of the amino acids we take in lungs.
are not used. They are converted The water and ion content
into urea by the liver and excretedof cells must be carefully
by the kidneys in the urine. Urine controlled. If they are not,
can be stored in the bladder. the too much or too little
The thermoregulatory centre of water may move in or out
the brain and the receptors in the of cells during osmosis.
skin detect changes in temperature If you get too hot:
and controls the body's response to ·Blood vessels near the
a change in a internal temperature. surface of the skin dilate
allowing more blood to
flow through the skin
capillaries. Heat is lost by
radiation
·Sweat glands produce
more sweat. This
evaporates from the skin'
s surface. The energy
required for it to
evaporate comes from the
surface.
If you get too cold:
·Blood vessels near the surface of the skin constrict and less
blood flows through the skin capillaries. Less heat is radiated.
·We `shiver'. Muscles contract quickly. This requires
respiration and some of the energy produced is released as
heat.…read more

Slide 2

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The pancreas monitors and controls If there is too much
the level of sugar in our blood. sugar in our blood then
When your blood glucose the pancreas produces
concentration falls below the ideal the hormone insulin that
range, the pancreas secretes results in the excess
glucagon. Glucagon makes your liver sugar being stored in the
break down glycogen, converting it liver as glycogen. If
back to glucose. In this way stored insulin is not produced the
sugar is released back into the blood sugar level may
blood. become fatally high. If
the pancreas is not
producing insulin this is
known as diabetes. It can
be controlled by diet or
the person may need
insulin injections.…read more

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