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Homeostasis: control in the body
Descripción
A-Level (Homeostasis) Biology Mapa Mental sobre Homeostasis: control in the body, creado por crossers_x el 23/11/2013.
Sin etiquetas
biology
homeostasis
biology
homeostasis
a-level
Mapa Mental por
crossers_x
, actualizado hace más de 1 año
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Creado por
crossers_x
hace más de 10 años
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Resumen del Recurso
Homeostasis: control in the body
WATER LEVEL
method
in
food and drinks
out
breathing
urine and faeces
sweat
Kidneys regulate water content of the body
ADH
blood too concentrated, releases ADH
kidneys release less water, stays in blood
remove excess fluid
send to bladder
stored then eliminated as urine
when hot or exercisng we lose water through sweat
we then produce less urine, although it is more concentrated
blood glucose level
provides energy supply
pancreas
detects high levels (after a meal)
releases insulin
stored as glycogen by muscles
detects low levels (exercise)
releases glucagon
converts glycogen back to glucose
Diabetics often either don't produce insulin or cant detect it
TEMPERATURE
methods
sweating
too cold: no sweating
too hot: sweating increases, evaporation cools skin
hairs
too cold: hairs stand up to trap a layer of air
too hot: hairs lie flat
shivering
too hot: muscle activity reduces
too cold: contractions generate heat
blood flow to skin
too hot: blood vessels dilate , so more blood to skin(vasodilation)
too cold: blood vessels constrict, reducing blood flow(vasoconstriction)
IONS + SALTS
lost through
skin as sweat
kidneys as urine
includes
sodium
chloride
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