Difference between revisions of "Vein"
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===About Veins=== | ===About Veins=== | ||
: Most, but not all, '''veins''' carry [[deoxygenated]] [[blood]]. | : Most, but not all, '''veins''' carry [[deoxygenated]] [[blood]]. | ||
| + | ::The pulmonary '''vein''' carries [[oxygenated]] [[blood]] from the [[lung]]s to the [[heart]]. | ||
Revision as of 10:45, 24 April 2019
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 a vein. |
About Veins
- Most, but not all, veins carry deoxygenated blood.
- The pulmonary vein carries oxygenated blood from the lungs to the heart.