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The concave shape of red blood cells maximises the surface area for gaseous exchange of carbon dioxide and oxygen. It perfectly holds 4 haemoglobin molecules, each of which works to store and release oxygen when needed. The importance of its' shape is exemplified by the genetic disease sickle cell anaemia, whereby misshapen red blood cells (called sickled cells) can no longer carry oxygen in the same way and can become lodged in small capillary blood vessels - which can kill.

Additionally, they are very durable and able to squeeze in and out of capillaries to reach every part of the body whilst maintaining a large surface area for exchange. Cells which loose this elastic property are removed by the spleen and liver.

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12y ago
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15y ago

Well if you think about it xylem are the thick secondary cell walls, often deposied unevelny in a coil-like patter so that they may stretch so if you can figure way to see how its related to now then it's good *

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16y ago

It's structure is a series of long tubes, blood vessels, and that helps their function which is to transport blood.

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14y ago

Venules- Drains blood from capillaries into veins, for return to the heart == ==

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13y ago

Flat disk like shape alloes it to carry more oxygen and carbon dioxide around the body.

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13y ago

it look likes a branch of trees

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12y ago

you

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Q: What is the structure of the blood vessels?
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