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How does the structure of capillaries allow them to transport the substances through the blood?

2)How does the structure of capillaries allow them to transport the substances (food) through the blood?

Public Comments

1. Capillaries are very thin and therefore allow the substances to be diffused out of the thin layer of vein/artery. They are also very small and allow for a smaller amount of blood cells to be transported at one which helps to slow them down (also they are further away from heart) and deposit their substances to each cell.
2. As stated in the question, the main function of capillaries is to transport substnces to and from cells. In order to perform this job well it must has an ideal structure that will alow such functions. E.g. : Capillaries are 1 cell thick which allows them to penetrate through tissues easily and they can therefore be very close to cells. Because it is 1 cell thick this also allows substances to pass very quickly across its wall to the cells. The capillaries also contain pores in their walls which allow the passage of permeable substances to the cells.
3. Though the capillaries are thin, they are able to transport food to various organs as the heart pumps blood. It exerts a pressure on the blood flow and blood can move through capillaries.