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以人为代表的恒温动物对寒冷的反应表现为减少散热,即以隔热保温或增加产热两种形式。反复的寒冷刺激能促进耐寒性增强,这种机体在寒冷环境中为维持体温而发生的相应变化称之为适应。人类没有起隔热作用的毛,而具有散热功能的汗腺很发达,由此认为人起源于热带动物,但是,人对寒冷也具有很强的耐受性。达尔文观察处于原始生活状态的人(南美印第安人,澳大利亚高原土著居民,挪威拉普族人)
The human-represented thermostatic animal’s response to the cold appears to be to reduce the heat, that is, to heat insulation or increase heat production in both forms. Repeated cold stimulation can promote increased cold tolerance, the body in a cold environment to maintain the body temperature and the corresponding changes occur as adaptation. Human hair does not play a role in insulation, and sweat glands with cooling function is very developed, thus that people originated in tropical animals, but people are also very cold tolerance. Darwin observes people in primitive life (South American Indians, Australian Plateau Indigenous People, Norwegian Rups)