Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

What hormones are secreted by the adrenal medulla, and what are their functions?

Summary Introduction

To review:

Hormones secreted by the adrenal medulla and their functions.


The adrenal medulla is the inner portion of the adrenal gland that is positioned on the kidney’s top and originates from the ectoderm layer. It has hormone secreting chromaffin cells. Hormones produced by it regulate the metabolic activities in the body.


The adrenal medulla is the inner soft part of the adrenal gland. The two amines, namely, epinephrine and norepinephrine are secreted by it. Basically, these hormones are catecholamines that are derived from Tyrosine (an amino acid), which circulate in the blood. These hormones are secreted when an individual encounters stressful situation like anger, fear, danger (fight-or-flight situations), infections, excitement or injury.

Epinephrine prepares the body to handle physical excursion or stress. It causes the release of fatty acids and glucose into the blood as fuels. The blood vessels of the heart, lungs, and skeletal muscles dilate to enhance blood flow...

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