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Human Biology (MindTap Course List)

11th Edition
Cecie Starr + 1 other
Publisher: Cengage Learning
ISBN: 9781305112100

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Chapter
Section
BuyFindarrow_forward

Human Biology (MindTap Course List)

11th Edition
Cecie Starr + 1 other
Publisher: Cengage Learning
ISBN: 9781305112100
Chapter 15, Problem 1SQ
Textbook Problem
39 views

__________ are molecules released from a signaling cell that have effects on target cells.

  1. a. Hormones
  2. b. Neurotransmitters
  3. c. Local signaling molecules
  4. d. Pheromones
  5. e. a and b
  6. f. all of the above

Summary Introduction

Introduction: The cells that are influenced by a particular hormone are known as target cells. They have specific binding receptors on the surface of the cell or within the cell. Signaling molecules bind to these receptors to produce a characteristic response. Target cells may be present far from the endocrine gland or in another endocrine gland, or in different types of organ, such as a kidney, or bone.

Explanation of Solution

Reasons for the correct answers:

Option f. is given as “all of the above”.

Hormones, neurotransmitters, local signaling molecules, and pheromones are released from signaling cells. They affect target cells in various ways. Hormones are carried by the blood to target cells. Neurotransmitters are released at the synapses present between neurons and targets cells. Local signaling molecules are released in tissues and diffuse to target cells. Pheromones are synthesized and released into the environment by an animal and reach target cells in another individual.

Hence, the correct answer is option f.

Reasons for the incorrect answers:

Option a. is given as “Hormones”.

Hormones are molecules released from a signaling cell that have effects on target cells. As other options are also correct, hence option a. is incorrect.

Option b. is given as “Neurotransmitters”...

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