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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 2166 Jason Jarrell 05-Mar-18 17:37
Re: The Socio-Political Structure of Adena Societies 335 Susan Doris 06-Mar-18 06:01
Re: The Socio-Political Structure of Adena Societies 362 drdavidanderson 06-Mar-18 10:15
Re: The Socio-Political Structure of Adena Societies 352 Susan Doris 06-Mar-18 12:48
Re: The Socio-Political Structure of Adena Societies 330 Aine 07-Mar-18 03:44
Re: The Socio-Political Structure of Adena Societies 333 Jason Jarrell 07-Mar-18 04:12
Re: The Socio-Political Structure of Adena Societies 332 Aine 07-Mar-18 04:36
Re: The Socio-Political Structure of Adena Societies 331 Jason Jarrell 07-Mar-18 05:09
Re: The Socio-Political Structure of Adena Societies 315 Aine 07-Mar-18 13:40
Re: The Socio-Political Structure of Adena Societies 321 Jason Jarrell 07-Mar-18 18:26
Re: The Socio-Political Structure of Adena Societies 321 Aine 07-Mar-18 21:41
Re: The Socio-Political Structure of Adena Societies 350 Jason Jarrell 08-Mar-18 00:18
Re: The Socio-Political Structure of Adena Societies 339 Aine 08-Mar-18 22:52
Re: The Socio-Political Structure of Adena Societies 331 Aine 07-Mar-18 03:46
Re: The Socio-Political Structure of Adena Societies 322 Susan Doris 07-Mar-18 05:59
Re: The Socio-Political Structure of Adena Societies 338 Jason Jarrell 07-Mar-18 07:55
Re: The Socio-Political Structure of Adena Societies 320 Aine 07-Mar-18 13:18
Re: The Socio-Political Structure of Adena Societies 328 Susan Doris 07-Mar-18 14:39
Re: The Socio-Political Structure of Adena Societies 326 SkinwalkerScrooge 09-Mar-18 19:51
Re: The Socio-Political Structure of Adena Societies 310 Susan Doris 10-Mar-18 06:03
Re: The Socio-Political Structure of Adena Societies 320 drdavidanderson 10-Mar-18 07:52
Re: The Socio-Political Structure of Adena Societies 311 Susan Doris 10-Mar-18 08:40
Re: The Socio-Political Structure of Adena Societies 311 SkinwalkerScrooge 10-Mar-18 09:09
Re: The Socio-Political Structure of Adena Societies 323 Aine 10-Mar-18 13:49
Re: The Socio-Political Structure of Adena Societies 311 Jason Jarrell 10-Mar-18 21:04
Re: The Socio-Political Structure of Adena Societies 312 Aine 10-Mar-18 13:31
Re: The Socio-Political Structure of Adena Societies 311 Aine 10-Mar-18 13:16
Re: The Socio-Political Structure of Adena Societies 585 SkinwalkerScrooge 11-Mar-18 05:46


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