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GASTROINTESTINAL PHYSIOLOGY

Absorption of Essential Elements and Vitamins

Figurę 7.38 Absorption of Essential Vitamins and Elements .

The celi mechanisms involved in the absorption of Ca", iron, and several imporiant vitamins are summarized. Vitamin D, (1,25-dihy-droxy-vitamin D,) plays an imporiant role in stimulating inteslinal Ca ‘ absorption. Intrinsic tactor is madę by the stornach (see Figuro 7.12). If insufficient amounts of intrinsic tactor are produced, B,.. deficiency ensues. Failure to property digest fats (see Figurę 7.37) can lead to deficiencies of the fat-solu-ble vitamins. Abbreviations: DMTI, Divalenl metal transporter 1: FR. tuirireductase; H. hephaestin; IF, intrinsic factoi: IREC1, iron-regulated transporter 1; TCII, transcobalamin II; TF, transferom

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