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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 1558 Jason Jarrell 05-Mar-18 17:37
Re: The Socio-Political Structure of Adena Societies 246 Susan Doris 06-Mar-18 06:01
Re: The Socio-Political Structure of Adena Societies 262 drdavidanderson 06-Mar-18 10:15
Re: The Socio-Political Structure of Adena Societies 267 Susan Doris 06-Mar-18 12:48
Re: The Socio-Political Structure of Adena Societies 240 Aine 07-Mar-18 03:44
Re: The Socio-Political Structure of Adena Societies 244 Jason Jarrell 07-Mar-18 04:12
Re: The Socio-Political Structure of Adena Societies 237 Aine 07-Mar-18 04:36
Re: The Socio-Political Structure of Adena Societies 244 Jason Jarrell 07-Mar-18 05:09
Re: The Socio-Political Structure of Adena Societies 228 Aine 07-Mar-18 13:40
Re: The Socio-Political Structure of Adena Societies 234 Jason Jarrell 07-Mar-18 18:26
Re: The Socio-Political Structure of Adena Societies 233 Aine 07-Mar-18 21:41
Re: The Socio-Political Structure of Adena Societies 260 Jason Jarrell 08-Mar-18 00:18
Re: The Socio-Political Structure of Adena Societies 245 Aine 08-Mar-18 22:52
Re: The Socio-Political Structure of Adena Societies 243 Aine 07-Mar-18 03:46
Re: The Socio-Political Structure of Adena Societies 233 Susan Doris 07-Mar-18 05:59
Re: The Socio-Political Structure of Adena Societies 254 Jason Jarrell 07-Mar-18 07:55
Re: The Socio-Political Structure of Adena Societies 229 Aine 07-Mar-18 13:18
Re: The Socio-Political Structure of Adena Societies 234 Susan Doris 07-Mar-18 14:39
Re: The Socio-Political Structure of Adena Societies 236 SkinwalkerScrooge 09-Mar-18 19:51
Re: The Socio-Political Structure of Adena Societies 222 Susan Doris 10-Mar-18 06:03
Re: The Socio-Political Structure of Adena Societies 230 drdavidanderson 10-Mar-18 07:52
Re: The Socio-Political Structure of Adena Societies 219 Susan Doris 10-Mar-18 08:40
Re: The Socio-Political Structure of Adena Societies 221 SkinwalkerScrooge 10-Mar-18 09:09
Re: The Socio-Political Structure of Adena Societies 233 Aine 10-Mar-18 13:49
Re: The Socio-Political Structure of Adena Societies 220 Jason Jarrell 10-Mar-18 21:04
Re: The Socio-Political Structure of Adena Societies 221 Aine 10-Mar-18 13:31
Re: The Socio-Political Structure of Adena Societies 226 Aine 10-Mar-18 13:16
Re: The Socio-Political Structure of Adena Societies 450 SkinwalkerScrooge 11-Mar-18 05:46


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