Difference between revisions of "Vein"

Revision as of 16:27, 7 November 2018

An vein is a blood vessel which carries blood to the heart.

An vein is a blood vessel which carries low pressure blood to the heart.

Veins have a thin layer of muscle because the blood is a low pressure.

Veins have few layers of elastic tissue as the blood is a low pressure.

Veins have valves in them to stop the blood flowing in the wrong direction because it is such a low pressure.

Veins often pass between muscles which work with the valves by contracting to force the blood through the vein.


A diagram of an vein.

Most, but not all, arteries carry oxygenated blood.

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 ==Key Stage 3==
 ===Meaning===
-A [[vein]] is a [[blood vessel]] which carries [[blood]] to the [[heart]].
+An [[vein]] is a [[blood vessel]] which carries [[blood]] to the [[heart]].
 ===Key Stage 4===
 ===Meaning===
-A [[vein]] is a [[blood vessel]] which carries low [[pressure]] [[blood]] to the [[heart]].
+An [[vein]] is a [[blood vessel]] which carries low [[pressure]] [[blood]] to the [[heart]].
+===Adaptations of Arteries===
+: [[Vein]]s have a thin layer of [[muscle]] because the [[blood]] is a low [[pressure]].
+: [[Vein]]s have few layers of elastic [[tissue]] as the [[blood]] is a low [[pressure]].
+: [[Vein]]s have [[valve]]s in them to stop the [[blood]] flowing in the wrong direction because it is such a low [[pressure]].
+: [[Vein]]s often pass between [[muscle]]s which work with the [[valve]]s by contracting to force the [[blood]] through the [[vein]].
+{| class="wikitable"
+|-
+|[[File:Vein.png|center|300px]]
+|-
+| style="height:20px; width:200px; text-align:center;" |A [[diagram]] of an [[vein]].
+|}
+===About Arteries===
+: Most, but not all, '''arteries''' carry [[oxygenated]] [[blood]].