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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Injection of C. botulinum toxin (Botox) _______.

  1. a. causes irreversible muscle contraction
  2. b. stimulates formation of ATP from ADP
  3. c. prevents release of ACh by motor neurons.
  4. d. blocks the actin binding site of myosin

Summary Introduction

Introduction: The functioning of the muscles weakens when there is a disturbance in the signaling of the motor neurons. When an action potential reaches the neuromuscular junction, it causes the release of the acetylcholine (ACh).

Explanation

Reason for the correct answer:

The ACh are released when an action potential reaches the neuromuscular junction. A Clostridium species known as C. botulinum releases the botulinum toxin. This toxin inhibits the ACh release by motor neurons, which in turn prevents the contraction of muscles. The botulinum toxin are also utilized in the cosmetic procedures in controlled amounts. The injection of Botox into a particular facial muscle will prevent the contraction. As a result, wrinkles are not formed.

Option c. is given as “prevents release of ACh by motor neurons”.

C. botulinum releases the botulinum toxin. This toxin inhibits the ACh release by motor neurons, which in turn prevents the contraction of muscles.

Hence, the correct answer is option c.

Reasons for the incorrect answers:

Option a...

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