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Susan,
A little bit of a quibble here. Almost all of our Vitamin D in nature is not dietary in origin, but comes from skin exposure to UV light of a specific wavelength that is needed to cleave the B ring of dihydrotachysterol to pre-Vitamin D3, which is then hydroxylated in the liver to the main storage form, 25-hydroxycholecalciferol. They did not depend on dietary sources because they will I presume have had plenty of sunlight exposure at least in summer. The active form is 1,25 dihydroxycholecalciferol, which many tissues produce locally, and systemically is produced in the kidney under the action of parathyroid hormone, which is secreted in response to a fall in circulating ionised calcium, and acts on the small intestine to promote calcium absorption.

A giant with prognathism has excess growth hormone until proved otherwise
David

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Subject Views Written By Posted
The Socio-Political Structure of Adena Societies 1699 Jason Jarrell 05-Mar-18 17:37
Re: The Socio-Political Structure of Adena Societies 296 Susan Doris 06-Mar-18 06:01
Re: The Socio-Political Structure of Adena Societies 316 drdavidanderson 06-Mar-18 10:15
Re: The Socio-Political Structure of Adena Societies 315 Susan Doris 06-Mar-18 12:48
Re: The Socio-Political Structure of Adena Societies 293 Aine 07-Mar-18 03:44
Re: The Socio-Political Structure of Adena Societies 295 Jason Jarrell 07-Mar-18 04:12
Re: The Socio-Political Structure of Adena Societies 287 Aine 07-Mar-18 04:36
Re: The Socio-Political Structure of Adena Societies 295 Jason Jarrell 07-Mar-18 05:09
Re: The Socio-Political Structure of Adena Societies 277 Aine 07-Mar-18 13:40
Re: The Socio-Political Structure of Adena Societies 284 Jason Jarrell 07-Mar-18 18:26
Re: The Socio-Political Structure of Adena Societies 284 Aine 07-Mar-18 21:41
Re: The Socio-Political Structure of Adena Societies 310 Jason Jarrell 08-Mar-18 00:18
Re: The Socio-Political Structure of Adena Societies 295 Aine 08-Mar-18 22:52
Re: The Socio-Political Structure of Adena Societies 293 Aine 07-Mar-18 03:46
Re: The Socio-Political Structure of Adena Societies 284 Susan Doris 07-Mar-18 05:59
Re: The Socio-Political Structure of Adena Societies 302 Jason Jarrell 07-Mar-18 07:55
Re: The Socio-Political Structure of Adena Societies 281 Aine 07-Mar-18 13:18
Re: The Socio-Political Structure of Adena Societies 287 Susan Doris 07-Mar-18 14:39
Re: The Socio-Political Structure of Adena Societies 289 SkinwalkerScrooge 09-Mar-18 19:51
Re: The Socio-Political Structure of Adena Societies 271 Susan Doris 10-Mar-18 06:03
Re: The Socio-Political Structure of Adena Societies 280 drdavidanderson 10-Mar-18 07:52
Re: The Socio-Political Structure of Adena Societies 272 Susan Doris 10-Mar-18 08:40
Re: The Socio-Political Structure of Adena Societies 271 SkinwalkerScrooge 10-Mar-18 09:09
Re: The Socio-Political Structure of Adena Societies 284 Aine 10-Mar-18 13:49
Re: The Socio-Political Structure of Adena Societies 273 Jason Jarrell 10-Mar-18 21:04
Re: The Socio-Political Structure of Adena Societies 272 Aine 10-Mar-18 13:31
Re: The Socio-Political Structure of Adena Societies 277 Aine 10-Mar-18 13:16
Re: The Socio-Political Structure of Adena Societies 529 SkinwalkerScrooge 11-Mar-18 05:46


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