Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

_______ are signaling molecules that travel through the blood and affect distant cells in the same individual.

  1. a. Hormones
  2. b. Neurotransmitters
  3. c. Pheromones
  4. d. Neuromodulators

Summary Introduction

Introduction: In multicellular organisms, hormones are a certain class of signaling molecules that are produced by glands and transported throughout the body by the circulatory system. Hormones have specified the physiological and behavioral function. They travel through blood vessels and reach their target organs to perform their regulatory function.


Reason for the correct answer:

Hormones are the chemical or organic substance secreted by glands that act as messengers in the body. These messengers perform major roles in many body functions.

Hence, the correct answer is option a.

Reasons for the incorrect answers:

Option b. is given as “Neurotransmitters”.

This is incorrect because neurotransmitters are different from hormones. Neurotransmitters are the chemical agents that are produced by the neurons for stimulating the neighboring cell.

They are specifically meant for transferring neurological information through passing impulses from one cell to another. As the hormones, they are not released to blood.

Hence, option b is incorrect.

Option c. is given as “Pheromones”.

This is incorrect because pheromones are different from hormones...

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