Vitamin D₃ formed within the skin has all of these effects on other organ systems, except that it
A) is essential for absorption of calcium and phosphorus by the digestive system.
B) functions as a precursor for the hormone calcitriol in the endocrine system.
C) is essential for bone maintenance.
D) functions in the activation of plasma cells by the lymphatic system.
E) is essential for bone growth.

Question

Quizplus · Accepted Answer

Vitamin D₃ does not have a direct effect on the activation of plasma cells by the lymphatic system. Its primary roles are in regulating calcium and phosphorus metabolism, promoting bone health, and supporting immune function.

Vitamin D₃ Formed Within the Skin Has All of These