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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 2397 Jason Jarrell 05-Mar-18 17:37
Re: The Socio-Political Structure of Adena Societies 403 Susan Doris 06-Mar-18 06:01
Re: The Socio-Political Structure of Adena Societies 434 drdavidanderson 06-Mar-18 10:15
Re: The Socio-Political Structure of Adena Societies 439 Susan Doris 06-Mar-18 12:48
Re: The Socio-Political Structure of Adena Societies 398 Aine 07-Mar-18 03:44
Re: The Socio-Political Structure of Adena Societies 405 Jason Jarrell 07-Mar-18 04:12
Re: The Socio-Political Structure of Adena Societies 413 Aine 07-Mar-18 04:36
Re: The Socio-Political Structure of Adena Societies 400 Jason Jarrell 07-Mar-18 05:09
Re: The Socio-Political Structure of Adena Societies 388 Aine 07-Mar-18 13:40
Re: The Socio-Political Structure of Adena Societies 400 Jason Jarrell 07-Mar-18 18:26
Re: The Socio-Political Structure of Adena Societies 391 Aine 07-Mar-18 21:41
Re: The Socio-Political Structure of Adena Societies 437 Jason Jarrell 08-Mar-18 00:18
Re: The Socio-Political Structure of Adena Societies 413 Aine 08-Mar-18 22:52
Re: The Socio-Political Structure of Adena Societies 409 Aine 07-Mar-18 03:46
Re: The Socio-Political Structure of Adena Societies 397 Susan Doris 07-Mar-18 05:59
Re: The Socio-Political Structure of Adena Societies 409 Jason Jarrell 07-Mar-18 07:55
Re: The Socio-Political Structure of Adena Societies 386 Aine 07-Mar-18 13:18
Re: The Socio-Political Structure of Adena Societies 393 Susan Doris 07-Mar-18 14:39
Re: The Socio-Political Structure of Adena Societies 410 SkinwalkerScrooge 09-Mar-18 19:51
Re: The Socio-Political Structure of Adena Societies 393 Susan Doris 10-Mar-18 06:03
Re: The Socio-Political Structure of Adena Societies 391 drdavidanderson 10-Mar-18 07:52
Re: The Socio-Political Structure of Adena Societies 383 Susan Doris 10-Mar-18 08:40
Re: The Socio-Political Structure of Adena Societies 381 SkinwalkerScrooge 10-Mar-18 09:09
Re: The Socio-Political Structure of Adena Societies 394 Aine 10-Mar-18 13:49
Re: The Socio-Political Structure of Adena Societies 382 Jason Jarrell 10-Mar-18 21:04
Re: The Socio-Political Structure of Adena Societies 382 Aine 10-Mar-18 13:31
Re: The Socio-Political Structure of Adena Societies 380 Aine 10-Mar-18 13:16
Re: The Socio-Political Structure of Adena Societies 709 SkinwalkerScrooge 11-Mar-18 05:46


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