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==Key Stage 3==
[[File:ReproductiveSystemTestis.png|right|300px|thumb|A [[diagram]] showing a '''testis''' in the [[Male Reproductive System]].]]
===Meaning===
The [[testes]] are a pair of [[Organ|organs]] in the [[Male Reproductive System|male reproductive system]] located behind the [[penis]] in the [[scrotum]] responsible for making [[sperm]].
: Singular [[Noun]]: '''Testis'''
: Plural [[Noun]]: '''Testes'''
===About the Testes===
: The [[testes]] are found inside a sack called the [[scrotum]].
: The [[testes]] are outside the body instead of inside because [[Sperm Cell|sperm]] need to be kept cooler than [[Human Body Temperature|body temperature]] to survive.
: The [[testes]] are always making new [[Sperm Cell|sperm]].
==Key Stage 4==
[[File:ReproductiveSystemTestis.png|right|300px|thumb|A [[diagram]] showing a '''testis''' in the [[Male Reproductive System]].]]
===Meaning===
The [[testes]] are a pair of [[Organ|organs]] in the [[Male Reproductive System|male reproductive system]] responsible for making [[sperm]]. They are also [[Endocrine Gland|endocrine glands]] in the [[Endocrine System|endocrine system]].
===About Testes in the Male Repdroductive System===
: The '''testes''' produce the male [[gamete]] known as [[sperm]].
: The [[testes]] are found inside a sack called the [[scrotum]].
: During [[ejaculation]] the [[sperm|sperm cells]] leave the [[testes]] via the [[Sperm Duct|sperm duct]].
===About the Testes as Endocrine Glands===
: The [[testes]] [[secrete]] a [[hormone]] called [[testosterone]].
: [[Testosterone]] causes the expression of male characteristics during [[puberty]] including [[muscle]] growth, growth of facial hair and the deepening of the voice.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1782946381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946381&linkCode=as2&tag=nrjc-21&linkId=5ec5fc3f6429e30c1d9ab9bca2bccf93 ''Testes, page 182, GCSE Combined Science Trilogy; Biology, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Testes, page 208, GCSE Biology, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Testes, pages 12, 13, 17, GCSE Combined Science Trilogy 2, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10347 ''Testes, pages 61, 63, GCSE Combined Science; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Testes, pages 73, 77, GCSE Biology; The Revision Guide, CGP, AQA '']
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Testes, page 142, GCSE Biology, Pearson, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Testes, page 225, GCSE Biology, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Testes, page 77, GCSE Biology; The Revision Guide, CGP, Edexcel '']
====OCR====
:[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Testes, page 37, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']