Chapter 17.4, Problem 7AYLO

Summary Introduction

To discuss:

How to overcome the problem while transporting thyroid and steroid hormones in the blood and how the transport mechanism affects the half-life of hormones.                      

Introduction:

Hormones are chemical messengers secreted by the endocrine glands or neurosecretory cells into the extracellular fluids. The secreted hormones reach the target cells through the bloodstream, and they stimulate response of other tissues or cells. Hormones bind only to specific cells based on their corresponding receptors present on cells. Hormones act through chemical signals. They regulate growth, development, blood pressure, metabolism, fluid concentration, and maintain homeostasis in the body. Both positive feedback and negative feedback mechanisms may regulate hormone pathways. Positive feedback amplifies the stimulus, whereas negative feedback dampens the stimulus and stops the pathway.