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Skin
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===Meaning===
[[File:Skin.png|right|300px|thumb|A picture of human [[skin]] with some hairs.]]
The [[skin]] is an [[organ]] covering the body.
==Key Stage 3==
===Meaning===
The [[skin]] is an [[organ]] covering the body used to protect [[Internal Organ|internal organs]] from [[infection]].
==Key Stage 4==
[[File:SkinDiagram.png|right|300px|thumb|A [[diagram]] showing the features of the [[skin]] involved in [[thermoregulation]].]]
===Meaning===
The [[skin]] is an [[organ]] covering the body used to protect [[Internal Organ|internal organs]] from [[infection]].
: The [[skin]] is a physical barrier to prevent [[infection]] by [[pathogen]]s.
: The [[skin]] is used in [[thermoregulation]].
When the [[Body Temperature|body temperature]] is too high:
*[[Sweat Gland|Sweat glands]] on the [[skin]] [[secrete]] [[sweat]] which [[evaporate]]s from the [[skin]] cooling it down.
*[[Erector Muscle|Erector muscles]] relax allowing the body hairs to lie flat on the [[skin]].
*[[Blood Vessel|Blood vessels]] near the surface of the [[skin]] [[Vasodilation|dilate]] to allow more of the warm [[blood]] to pass its [[Thermal Energy Store|thermal energy]] on to the [[skin]].
When the [[Body Temperature|body temperature]] is too low:
*[[Sweat Gland|Sweat glands]] stop [[secrete|secreting]] [[sweat]] and the [[skin]] becomes dry.
*[[Erector Muscle|Erector muscles]] contract causing body hairs to stand on end. This creates a pocket of trapped air under the hairs which insulates the body.
*[[Blood Vessel|Blood vessels]] near the surface of the [[skin]] [[Vasoconstriction|constrict]] reducing [[blood]] flow close to the [[skin]] preventing [[Thermal Energy Store|thermal energy]] being lost to the [[skin]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Skin, page 90, GCSE Biology; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f511 ''Skin, pages 106-7, 148, 189, GCSE Biology; Student Book, Collins, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851338/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851338&linkCode=as2&tag=nrjc-21&linkId=425855d5890466e47189e1c21b67a1ea ''Skin, pages 85-6, GCSE Biology, Hodder, AQA '']
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Skin, pages 222-223, Gateway GCSE Biology, Oxford, OCR '']
==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=OxPlCkTKhzY}}