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Vitamin D + Heat

Chapter 5 - A & P Lecture

QuestionAnswer
what is the vitamin D hormone? calcitriol
what does calcitriol do? stimulates uptake of Ca/P from intestines, promotes Ca/P relase from bones, reduces Ca loss from kidneys, increase blood Ca levels
how is calcitriol formed? 7 dehydrocholesterol converts to cholecalciferol when exposed to UV radiation, cholecalciferol released to blood and modified in the liver and kidneys to form active vitamin D (calcitriol)
what type of people are calcitriol deficient? people in cold climates & who cover there body outside (can be absorbed through intestinal wall)
what are sources of vitamin D? dairy, liver, egg yolks, supplements
desceibe heat exchange in the skin when the body is too hot? 1) arterioles in dermis dilate (allows warm blood to flow) 2) sweat is produced + evaporates 3) reducing body temp.
desceibe heat exchange in the skin when the body is too cold? 1) blood vessels in dermis constrict (allows less warm blood to flow) 2) reduced blood flow through skin 3) conserves heat
 

 



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