. Human physiology. ough the form a, artery; v, vein; e, epithelial lining;m, middle muscular and elastic -coat,thick in the artery, much thinner in thevein ; a, outer coat of areolar tissue(magnified 350 diameters). THE BLOOD-VESSELS AND CIRCULATION 131 of this network varies considerably in different parts. The wallsof capillaries are exceedingly thin, so that fluids very readily oozethrough them, and, on this account, the changes which the bloodundergoes during its circulation take place chiefly in these vessels. After the blood has passed through the meshes of the capil-laries, it is colle
. Human physiology. ough the form a, artery; v, vein; e, epithelial lining;m, middle muscular and elastic -coat,thick in the artery, much thinner in thevein ; a, outer coat of areolar tissue(magnified 350 diameters). THE BLOOD-VESSELS AND CIRCULATION 131 of this network varies considerably in different parts. The wallsof capillaries are exceedingly thin, so that fluids very readily oozethrough them, and, on this account, the changes which the bloodundergoes during its circulation take place chiefly in these vessels. After the blood has passed through the meshes of the capil-laries, it is collected up by very small veins. These small veinsunite, forming larger and larger veins, till at last they open intothe great veins which take the blood direct into the auricles. The structure of veins is very similar to that of walls are composed of the same three coats, but they arethinner, and the muscular and elastic fibres are not nearly soabundant. Hence the walls collapse when the veins are
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