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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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The sarcoplasmic reticulum stores and releases ________.

  1. a. ACh
  2. b. Calcium ions
  3. c. ATP
  4. d. Phosphate ions

Summary Introduction

Introduction: A membrane-bound structure called sarcoplasmic reticulum is a specialized smooth endoplasmic reticulum that mainly functions in the regulation of calcium ions that are present in the striated muscle cells. Calcium is a mineral that is mostly found in teeth and bones that provides them strength.

Explanation

Reason for the correct answer:

The sarcoplasmic reticulum that wraps around the myofibrils functions to store and release the calcium ions present in the striated muscle cells. It can permit to form cross-bridges between the actin and myosin during the contraction of muscles. When the calcium ion concentration increases the actin and myosin filaments interact with each other by changing the conformation of tropomyosin protein and troponin protein.

Option b. is given as “calcium ions”.

The calcium ions stored in the sarcoplasmic reticulum permit to form cross-bridges between the actin and myosin during the contraction of muscles.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “ACh”...

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