查看毛细血管的源代码

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您请求的操作仅限于组中的用户:==生理学==[[文件:血液与描述.png|右|无边框]]毛细血管壁是一层组织,非常薄,气体和其他物质(如氧气、水、蛋白质和脂肪)可以在压力差的驱动下通过。像二氧化碳和[[尿|尿素]]这样的废物会回到血液中,被运走,排出体外。*毛细血管床:毛细血管不是独立运作的。毛细血管床是供应器官的毛细血管交织的网络。细胞的代谢越活跃,就需要更多的毛细血管来提供营养并带走废物。毛细血管床可由两种血管组成:一种是真毛细血管,主要由小动脉分支,提供细胞间的交换和循环;血管分流术,在床的两端直接连接小动脉和小静脉的短血管,允许分流术https://med.libretexts.org/Bookshelves/Anatomy_and_Physiology/Book%3A_Anatomy_and_Physiology_(Boundless)/18%3A_Cardiovascular_System%3A_Blood_Vessels/18.2%3A_Arteries/18.2F%3A_Capillaries(访问12.7.2021) *毛细血管床通常移动不超过其所含血液量的25%,尽管这个量可以通过使[[肌肉]:平滑肌在通向毛细血管床的小动脉中松弛,并使小动脉变小。毛细血管壁没有这种平滑肌,所以毛细血管宽度的任何变化都是被动的。 Any [[Complement System|signaling molecules]] they release (such as endothelin for constriction and nitric oxide for dilation) act on the smooth muscle cells in the walls of nearby, larger vessels, e.g. arterioles. * Capillary's ability to move items can be increased by the release of certain [[cytokines]], eg in the inflammatory response. * During embryological development, new capillaries are formed by vasculogenesis, the process of blood vessel formation occurring by de novo production of endothelial cells and their formation into vascular tubes. The term angiogenesis denotes the formation of new capillaries from pre-existing blood vessels

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