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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 2273 Jason Jarrell 05-Mar-18 17:37
Re: The Socio-Political Structure of Adena Societies 369 Susan Doris 06-Mar-18 06:01
Re: The Socio-Political Structure of Adena Societies 399 drdavidanderson 06-Mar-18 10:15
Re: The Socio-Political Structure of Adena Societies 392 Susan Doris 06-Mar-18 12:48
Re: The Socio-Political Structure of Adena Societies 367 Aine 07-Mar-18 03:44
Re: The Socio-Political Structure of Adena Societies 369 Jason Jarrell 07-Mar-18 04:12
Re: The Socio-Political Structure of Adena Societies 368 Aine 07-Mar-18 04:36
Re: The Socio-Political Structure of Adena Societies 366 Jason Jarrell 07-Mar-18 05:09
Re: The Socio-Political Structure of Adena Societies 352 Aine 07-Mar-18 13:40
Re: The Socio-Political Structure of Adena Societies 364 Jason Jarrell 07-Mar-18 18:26
Re: The Socio-Political Structure of Adena Societies 359 Aine 07-Mar-18 21:41
Re: The Socio-Political Structure of Adena Societies 389 Jason Jarrell 08-Mar-18 00:18
Re: The Socio-Political Structure of Adena Societies 377 Aine 08-Mar-18 22:52
Re: The Socio-Political Structure of Adena Societies 366 Aine 07-Mar-18 03:46
Re: The Socio-Political Structure of Adena Societies 361 Susan Doris 07-Mar-18 05:59
Re: The Socio-Political Structure of Adena Societies 374 Jason Jarrell 07-Mar-18 07:55
Re: The Socio-Political Structure of Adena Societies 354 Aine 07-Mar-18 13:18
Re: The Socio-Political Structure of Adena Societies 364 Susan Doris 07-Mar-18 14:39
Re: The Socio-Political Structure of Adena Societies 364 SkinwalkerScrooge 09-Mar-18 19:51
Re: The Socio-Political Structure of Adena Societies 345 Susan Doris 10-Mar-18 06:03
Re: The Socio-Political Structure of Adena Societies 358 drdavidanderson 10-Mar-18 07:52
Re: The Socio-Political Structure of Adena Societies 348 Susan Doris 10-Mar-18 08:40
Re: The Socio-Political Structure of Adena Societies 349 SkinwalkerScrooge 10-Mar-18 09:09
Re: The Socio-Political Structure of Adena Societies 359 Aine 10-Mar-18 13:49
Re: The Socio-Political Structure of Adena Societies 347 Jason Jarrell 10-Mar-18 21:04
Re: The Socio-Political Structure of Adena Societies 350 Aine 10-Mar-18 13:31
Re: The Socio-Political Structure of Adena Societies 347 Aine 10-Mar-18 13:16
Re: The Socio-Political Structure of Adena Societies 640 SkinwalkerScrooge 11-Mar-18 05:46


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