. The American journal of anatomy. ls are withdrawn before any circulation has been establishedin them. Thus many definite records have been obtained inwhich the retrogression of a capillary has been associated withthe stoppage or absence of circulation. The conclusion, there-fore, seems justified that a vessel which is connected with therest of the circulating system of vessels, retrogresses and dis-appears if the circulation within it ceases for a sufficient lengthof time. The finding that the diminution in size of lumen which pre-cedes the retraction of capillaries involves the property, on
. The American journal of anatomy. ls are withdrawn before any circulation has been establishedin them. Thus many definite records have been obtained inwhich the retrogression of a capillary has been associated withthe stoppage or absence of circulation. The conclusion, there-fore, seems justified that a vessel which is connected with therest of the circulating system of vessels, retrogresses and dis-appears if the circulation within it ceases for a sufficient lengthof time. The finding that the diminution in size of lumen which pre-cedes the retraction of capillaries involves the property, on thepart of the endothelium, of reacting to the amount of blood flow-ing through the vessel, agrees, in part, with Thomas first histo-mechanical law. According to this law, however, it is the rate(Geschwindigkeit) of blood flow which is the determining fac-tor (93, p. 37 ff). In these studies it appears that, in capillaries,at least, it is not the rate but the amount of blood flow which is GROWTH OF BLOOD-VESSELS IN FROG LARVAE 67. 12 a
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectanatomy
