BIOLOGY (LL)
BIOLOGY (LL)
5th Edition
ISBN: 9781264115495
Author: BROOKER
Publisher: MCG
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Chapter 50.4, Problem 1CS
Summary Introduction

To propose: A revised model to depict the effect on Ca2+ homeostasis if bone cells are unable to respond to PTH (parathyroid hormone).

Introduction: Skin cells in the mammals that are receiving regular exposure to sunlight produces vitamin D from the precursor 7-dehydrocholesterol. Blood Ca2+ concentration does not decrease due to the secretion of parathyroid hormone. Bone cells release extra Ca2+ from the bones thereby increasing the concentration of calcium in the blood.

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