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==Key Stage 4==
===Meaning===
[[File:Blood.png|right|300px|thumb|A magnified image of blood going through a capillary.]]
A '''red blood cell''' is a [[Specialised Animal Cell|specialised animal cell]] used to transport [[oxygen]] around the body.
: When '''red blood cells''' die they are broken into small pieces called [[platelet]]s which help the [[blood]] clot when there is an open wound.
: If a person suffers from [[Sickle Cell Anemia]] the '''red blood cells''' are sickle shaped so they can become stuck in [[capillaries]].
{| class="wikitable"
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|[[File:BloodConstituents.png|center|300px]]
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| style="height:20px; width:200px; text-align:center;" |A [[diagram]] showing the [[percentage]]s of the different parts that make up [[blood]].
|}