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Homeostasis
Descripción
Explains the factors in homeostasis, and what factors need to be maintained
Sin etiquetas
biology
gcse
Mapa Mental por
Gemma Ghiandoni
, actualizado hace más de 1 año
Más
Menos
Creado por
Gemma Ghiandoni
hace más de 4 años
17
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Resumen del Recurso
Homeostasis
Homeostasis - the three factors that need to be maintained
Water content of the body
Heat
Sugar concentration
Negative Feedback: When a change away from the ideal, triggers a reaction designed to bring conditions back to normal
Temperature
Light intensity
Vasodilation
Vasoconstriction
Vasoconstriction is where the
Vasodilation
Nota:
Vasodilation is where the blood capillaries closes to the skin dilate in order to maximise heat loss when the body is too hot.
Vasoconstriction
Nota:
Vasoconstriction is where the blood capillaries further away from the skin dilate in order to minimise heat loss and retain thermal energy.
Cooling mechanisms
Evaporation of sweat
Nota:
Cools the skin and creates heat loss.
Radiation of heat from the blood
Hairs lie flat against the skin
Nota:
This means that the warm still doesn't get trapped between the hairs and the body gets cooler.
Warming mechanisms
Vasodilation
Nota:
The blood vessels don't dilate near to the skin in order to minimise heat loss across the epidermis.
Erect hairs
Nota:
They trap warm still air around the body.
Sweat glands don't make sweat
Nota:
So that the sweat doesn't cool the body.
Shivering
Nota:
Also one of the warming mechanisms in order to warm the body.
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