Human Biology: Concepts and Current Issues
Human Biology: Concepts and Current Issues
7th Edition
ISBN: 9780321821652
Author: Michael D. Johnson
Publisher: Benjamin Cummings
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Chapter 13, Problem 8CR
Summary Introduction

To review:

The rationale behind histamine and nitric oxide not being labeled as hormones despite being chemical messengers.

Introduction:

Hormones are essentially the chemical messengers secreted by endocrine glands. They help the specific parts to perform or stop specific functions. These chemicals are secreted in blood so they can reach their destination fast. There are many hormones in the human body. However, histamine and nitric oxide are not considered as hormones.

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