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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 1601 Jason Jarrell 05-Mar-18 17:37
Re: The Socio-Political Structure of Adena Societies 265 Susan Doris 06-Mar-18 06:01
Re: The Socio-Political Structure of Adena Societies 279 drdavidanderson 06-Mar-18 10:15
Re: The Socio-Political Structure of Adena Societies 284 Susan Doris 06-Mar-18 12:48
Re: The Socio-Political Structure of Adena Societies 258 Aine 07-Mar-18 03:44
Re: The Socio-Political Structure of Adena Societies 263 Jason Jarrell 07-Mar-18 04:12
Re: The Socio-Political Structure of Adena Societies 253 Aine 07-Mar-18 04:36
Re: The Socio-Political Structure of Adena Societies 262 Jason Jarrell 07-Mar-18 05:09
Re: The Socio-Political Structure of Adena Societies 245 Aine 07-Mar-18 13:40
Re: The Socio-Political Structure of Adena Societies 251 Jason Jarrell 07-Mar-18 18:26
Re: The Socio-Political Structure of Adena Societies 250 Aine 07-Mar-18 21:41
Re: The Socio-Political Structure of Adena Societies 277 Jason Jarrell 08-Mar-18 00:18
Re: The Socio-Political Structure of Adena Societies 262 Aine 08-Mar-18 22:52
Re: The Socio-Political Structure of Adena Societies 260 Aine 07-Mar-18 03:46
Re: The Socio-Political Structure of Adena Societies 252 Susan Doris 07-Mar-18 05:59
Re: The Socio-Political Structure of Adena Societies 270 Jason Jarrell 07-Mar-18 07:55
Re: The Socio-Political Structure of Adena Societies 247 Aine 07-Mar-18 13:18
Re: The Socio-Political Structure of Adena Societies 252 Susan Doris 07-Mar-18 14:39
Re: The Socio-Political Structure of Adena Societies 255 SkinwalkerScrooge 09-Mar-18 19:51
Re: The Socio-Political Structure of Adena Societies 238 Susan Doris 10-Mar-18 06:03
Re: The Socio-Political Structure of Adena Societies 247 drdavidanderson 10-Mar-18 07:52
Re: The Socio-Political Structure of Adena Societies 236 Susan Doris 10-Mar-18 08:40
Re: The Socio-Political Structure of Adena Societies 238 SkinwalkerScrooge 10-Mar-18 09:09
Re: The Socio-Political Structure of Adena Societies 250 Aine 10-Mar-18 13:49
Re: The Socio-Political Structure of Adena Societies 239 Jason Jarrell 10-Mar-18 21:04
Re: The Socio-Political Structure of Adena Societies 237 Aine 10-Mar-18 13:31
Re: The Socio-Political Structure of Adena Societies 242 Aine 10-Mar-18 13:16
Re: The Socio-Political Structure of Adena Societies 474 SkinwalkerScrooge 11-Mar-18 05:46


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