Chapter 21, Problem 21.117EP

Interpretation Introduction

Interpretation: The principle function of vitamin D in the human body has to be stated.

Concept introduction: The most important forms of Vitamin D are Vitamin ${\text{D}}_{\text{2}}$ and Vitamin ${\text{D}}_{\text{3}}$.  Vitamin ${\text{D}}_{\text{3}}$ is produced in the skin of humans and animals.