Difference between revisions of "Vein"
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An [[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=== | ===Meaning=== | ||
An [[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]]. | ||
Revision as of 16:39, 7 November 2018
Contents
Key Stage 3
Meaning
An vein is a blood vessel which carries blood to the heart.
Key Stage 4
Meaning
An vein is a blood vessel which carries low pressure blood to the heart.
Adaptations of Veins
- 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.
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| A diagram of an vein. |
About Veins
- Most, but not all, veins carry deoxygenated blood.