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| style="height:20px; width:300px; text-align:center;" |A [[diagram]] showing the features of the [[heart]].
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===References===
====Edexcel====
:[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Heart (structure of), page 63, GCSE Combined Science; The Revision Guide, 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 ''Heart (structure of), page 91, GCSE Biology; The Revision Guide, CGP, 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 ''Heart (structure of), pages 267, 268, GCSE Biology, CGP, Edexcel '']
===Extra Information===
{{#ev:youtube|https://www.youtube.com/watch?v=ruM4Xxhx32U}}
{{#ev:youtube|https://www.youtube.com/watch?v=GMBSU-2GK3E}}