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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 ________ is the basic unit of contraction.

  1. a. osteoblast
  2. b. sarcomere
  3. c. myofibril
  4. d. myosin filament

Summary Introduction

Introduction: The skeletal muscles are the voluntary muscles that help in the movement of bones and other structures. The sliding-filament model explains regarding the muscle contraction with the help of the proteins such as actin and myosin.

Explanation

Reason for the correct answer:

The sarcomeres are the contractile units present in the striated muscle tissue. These units are present between the two Z lines. The tubular muscle cells present in the skeletal muscles are known as muscle fibers that consist of many tubular myofibrils. These myofibrils possess the repeated units called sarcomere, which when observed under the microscope appears as alternating dark and light bands. 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 actin and myosin during the contraction of muscles.

Option b. is given as “sarcomere”.

The sarcomeres are the contractile units contained in the myofibrils that are connected end to end.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a...

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