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

Cytoplasmic extensions of _______ send and receive chemical messages.

  1. a. glial cells
  2. b. neurons
  3. c. fibroblasts
  4. d. melanocytes

Summary Introduction

Introduction: The body tissues contain a group of specialized cells which can organize as organs. A human body involves 4 main types of tissues- Muscle tissue, connective tissue, epithelial tissue, and nervous tissue. The nervous system is an arrangement of nerve cells which can transmit the signals in our body. The nervous system of invertebrates will be simple while that of vertebrates are more complex. They are mainly present in the spinal cord, brain and nerves.


Reason for the correct answer:

The nervous tissues can detect, receive, and transmit the chemical signals in our body to communicate with others. They mainly consist of three parts, central cell, dendrites, and axons.  The cytoplasmic extensions called axon and dendrites are projected out from the cell body. The dendrites are branched structures that project out from the cell body while the axons are unbranched. The dendrites receive the chemical signals which are then converted into electrical impulses. They transmit signals towards the cell body and axons transmit the chemical signals away from the cell body.

Option b. is given as “neurons”.

The neurons are the structural and functional unit of the nervous system. They can detect, receive, and transmit the messages from one place of the body to another.

Hence the correct answer is option b.

Reason for the incorrect answer:

Option a...

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