Human Biology (MindTap Course List)
Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 15, Problem 1RQ

Distinguish among hormones, neurotransmitters, local signaling molecules, and pheromones.

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Summary Introduction

To distinguish: Among hormones, neurotransmitters, local signaling molecules, and pheromones.

Introduction The endocrine system is the chemical signaling system that uses blood vessels as information channels. The endocrine glands are ductless organs located within the organ systems and contain groups of endocrine cells that secrete their hormones directly into their surroundings.

Explanation of Solution

The differences among hormones, neurotransmitters, local signaling molecules, and pheromones are as follows:

CriteriaHormonesNeurotransmitterLocal signaling moleculesPheromones
RangeLongSingle cell rangedShort distanceLong distance
Route to target cellsIt is carried by blood to target cells.It is released at the synapses present between neurons and target cells.It is released in tissues and diffuses to target cells.It is produced and released into the environment by an animal and reach target cells in another individual.
ExampleInsulinAdrenocorticotropic hormone

Morphogen

Androstenol

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