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3 which of the following is not involved in

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3. Which of the following is not involved in regulating plasma Ca2+ levels?A. KidneysB. SkinC. LiverD. LungsE. Intestine(inactive form)using 24-Hydroxylase. Skin: sunlight activates 7-Dehydrocholesterol intoVitamin D3 (cholecalciferol)Liver : converts Vitamin D3(cholecalciferol)to25-Hydroxycholecalciferolwith the use of 25-HydroxylaseIntestine: increasesabsorption of calciumin response toincreased vitamin D levelANSWER:DKidneys: converts 25-Hydroxycholecalciferol into1,25-Dihydroxycholecalciferol(active form)using-Hydroxylase and24,25-Dihydroxycholecalciferol
Ganong. Review of Medical Physiology 23rd ed. Chapter 23, page 3664. 1,25-Dihydroxycholecalciferol affects intestinal Ca2+ absorptionthrough a mechanism that:ANSWER: AGanong. Review of Medical Physiology 23rd ed. Chapter 23 , page 3655. Which of the following would you expect to find in a patient whose
diet has been low in calcium for 2 months?Increased formation of1,25 dihydroxycholecalciferol Increased amounts of calcium-binding protein inintestinal epithelial cellsIncreased parathyroid hormone secretionAlow plasma calcitonin concentrationDecreased plasma phosphateGanong. Review of Medical Physiology 23rd ed. Chapter 23 , page 368

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Ganong Review of Medical Physiology

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