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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 1753 Jason Jarrell 05-Mar-18 17:37
Re: The Socio-Political Structure of Adena Societies 316 Susan Doris 06-Mar-18 06:01
Re: The Socio-Political Structure of Adena Societies 341 drdavidanderson 06-Mar-18 10:15
Re: The Socio-Political Structure of Adena Societies 331 Susan Doris 06-Mar-18 12:48
Re: The Socio-Political Structure of Adena Societies 308 Aine 07-Mar-18 03:44
Re: The Socio-Political Structure of Adena Societies 314 Jason Jarrell 07-Mar-18 04:12
Re: The Socio-Political Structure of Adena Societies 308 Aine 07-Mar-18 04:36
Re: The Socio-Political Structure of Adena Societies 313 Jason Jarrell 07-Mar-18 05:09
Re: The Socio-Political Structure of Adena Societies 295 Aine 07-Mar-18 13:40
Re: The Socio-Political Structure of Adena Societies 304 Jason Jarrell 07-Mar-18 18:26
Re: The Socio-Political Structure of Adena Societies 302 Aine 07-Mar-18 21:41
Re: The Socio-Political Structure of Adena Societies 328 Jason Jarrell 08-Mar-18 00:18
Re: The Socio-Political Structure of Adena Societies 318 Aine 08-Mar-18 22:52
Re: The Socio-Political Structure of Adena Societies 311 Aine 07-Mar-18 03:46
Re: The Socio-Political Structure of Adena Societies 306 Susan Doris 07-Mar-18 05:59
Re: The Socio-Political Structure of Adena Societies 319 Jason Jarrell 07-Mar-18 07:55
Re: The Socio-Political Structure of Adena Societies 300 Aine 07-Mar-18 13:18
Re: The Socio-Political Structure of Adena Societies 305 Susan Doris 07-Mar-18 14:39
Re: The Socio-Political Structure of Adena Societies 307 SkinwalkerScrooge 09-Mar-18 19:51
Re: The Socio-Political Structure of Adena Societies 290 Susan Doris 10-Mar-18 06:03
Re: The Socio-Political Structure of Adena Societies 299 drdavidanderson 10-Mar-18 07:52
Re: The Socio-Political Structure of Adena Societies 290 Susan Doris 10-Mar-18 08:40
Re: The Socio-Political Structure of Adena Societies 291 SkinwalkerScrooge 10-Mar-18 09:09
Re: The Socio-Political Structure of Adena Societies 301 Aine 10-Mar-18 13:49
Re: The Socio-Political Structure of Adena Societies 292 Jason Jarrell 10-Mar-18 21:04
Re: The Socio-Political Structure of Adena Societies 290 Aine 10-Mar-18 13:31
Re: The Socio-Political Structure of Adena Societies 294 Aine 10-Mar-18 13:16
Re: The Socio-Political Structure of Adena Societies 556 SkinwalkerScrooge 11-Mar-18 05:46


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