Chapter 49.1, Problem 3C

Summary Introduction

To explain: The way in which the body response when the concentration of calcium decreases below the homeostatic level.

Introduction: Endocrine cells or neurosecretory cells secrete hormones into the extracellular fluids that are signaling molecules. The secreted hormones reach the target cells through the bloodstream. Hormones bind only to specific cells based on the corresponding receptors and they act through chemical signals. Homeostasis is the regulation of the internal conditions of the body to maintain an optimum internal environment despite changing external conditions.