Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 38.4, Problem 1TYK
Summary Introduction

Introduction: The main function of vitamin D in the homeostasis of calcium is to raise the absorption of calcium from the intestine. Absorption of calcium occurs usually by both an active transcellular pathway (energy-dependent) and by a passive paracellular pathway (non-energy dependent) across the tight junctions.

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