Anthropology 1020E Lecture Notes - Lecture 6: Capillary, Homeostasis, Melanocyte

• School: Western University
• Department: Anthropology
• Course: Anthropology 1020E
• Professor: Glenn Dolphin

Document Summary

Lab grade averages (out of 33): a= 27. 6, b= 25. 0, c= 28. 8, d= 24. 7. Huamn biological adaptation: plasticity, capacity to change physiologically in response to environmental stress, homeostasis, a condition of balance in a biological system. Examples: adaptations to heat: sweating, lose heat by evaporation cooling, can lose too much, vasodilation, capillaries at skin"s surface widen to allow increased blood flow. Examples: adaptations to cold: shivering, generates body heat, requires energy, vasoconstriction, restriction of capillaries/blood flow at skin"s surface, more efficient that heating up, can be too cold. Examples: adaptation to high altitudes: hypoxia, oxygen starvation (>2400 m) Short-term adaptation more red blood cells. Phenotypic variation: relatively homogenous species, thousands of genes, thousands ands of phenotypic outcomes, great deal of interest in, hair, eyes, skin, certain phenotypes are more common in some populations. February 3, 2014: gradual change in frequency of genotypes and phenotypes from one geographical region to another.