ANATOMY & PHYSIOLOGY (LL) W/CONNECT >I
ANATOMY & PHYSIOLOGY (LL) W/CONNECT >I
2nd Edition
ISBN: 9781259689192
Author: McKinley
Publisher: MCG CUSTOM
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Textbook Question
Chapter 10, Problem 2DYKB

The physiologic event that takes place at the plasma membrane of a skeletal muscle fiber is

  1. a. release of calcium.
  2. b. propagation of an action potential.
  3. c. binding of calcium by troponin.
  4. d. crossbridge cycling.
Expert Solution & Answer
Check Mark
Summary Introduction

Introduction:

Skeletal muscles are composed of 40-50% adult body weight. It is primarily attached to the skeleton of the body but also found at the opening of urinal tracts and gastrointestinal tracts.

Answer to Problem 2DYKB

Correct answer:

The propagation of action potential takes place at the plasma membrane of skeletal muscle fiber. Therefore, option b. is correct.

Explanation of Solution

Reason for the correct statement:

Option b. is given as “propagation of an action potential”. The plasma membrane is called as sarcolemma when present in skeletal muscle fiber and T-tubules invade the sarcolemma. Voltage-gated channels are located within the T-tubules and sarcolemma. These channels include both Voltage-gated Na+ channels and Voltage-gated K+ channels which participate in the conduction of action potential. Hence, sarcolemma (plasma membrane) helps in the propagation of action potential.

Hence, option b. is correct.

Reasons for the incorrect statements:

Option a. is given as “release of calcium”.

The physiological event of a release of calcium takes place at sarcoplasmic reticulum. Hence, option a. is incorrect.

Option c. is given as “binding of calcium by troponin”.

The physiological event of binding of calcium by troponin takes place in the sarcomere. Hence, option c. is incorrect.

Option d. is given as “cross-bridge cycling”.

The physiological event of cross-bridge cycling takes place in the sarcomere. Hence, option d. is incorrect.

Hence, options a., c., and d. are incorrect.

Conclusion

Action potential propagates along the length of the plasma membrane of skeletal muscle fiber.

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Chapter 10 Solutions

ANATOMY & PHYSIOLOGY (LL) W/CONNECT >I

Ch. 10.3 - Prob. 11WDYLCh. 10.3 - Prob. 12WDYLCh. 10.3 - Describe the four processes that repeat in...Ch. 10.3 - What causes the release of the myosin head from...Ch. 10.3 - How do acetylcholinesterase and Ca2+ pumps...Ch. 10.4 - Prob. 16WDYLCh. 10.4 - What are the various means for making ATP...Ch. 10.4 - Prob. 18WDYLCh. 10.5 - Prob. 19WDYLCh. 10.5 - Prob. 20WDYLCh. 10.5 - Prob. 21WDYLCh. 10.6 - What events are occurring in a muscle that produce...Ch. 10.6 - What is recruitment? Explain its importance in the...Ch. 10.6 - Prob. 24WDYLCh. 10.7 - What is the function of skeletal muscle tone?Ch. 10.7 - When you flex your biceps brachii while doing...Ch. 10.7 - Prob. 27WDYLCh. 10.7 - How can muscle fatigue result from changes in each...Ch. 10.8 - Prob. 29WDYLCh. 10.8 - Prob. 30WDYLCh. 10.9 - What are three anatomic or physiologic differences...Ch. 10.10 - Prob. 32WDYLCh. 10.10 - Prob. 33WDYLCh. 10.10 - Prob. 34WDYLCh. 10.10 - What are the steps of smooth muscle contraction?Ch. 10.10 - What unique characteristics of smooth muscle allow...Ch. 10.10 - Prob. 37WDYLCh. 10.10 - Prob. 38WDYLCh. 10.10 - Prob. 39WDYLCh. 10 - The physiologic event that takes place at the...Ch. 10 - In a skeletal muscle fiber, Ca2+ is released from...Ch. 10 - The bundle of dense regular connective tissue that...Ch. 10 - In excitation-contraction coupling, the transverse...Ch. 10 - During muscle contraction, the I band a. hides the...Ch. 10 - During a concentric contraction of a muscle fiber,...Ch. 10 - What event causes a troponin-tropomyosin complex...Ch. 10 - In sustained, moderate exercise, skeletal muscle...Ch. 10 - Skeletal muscle and cardiac muscle are similar in...Ch. 10 - Explain the structural relationship between a...Ch. 10 - Prob. 12DYKBCh. 10 - Prob. 13DYKBCh. 10 - Put the following skeletal muscle contraction...Ch. 10 - Explain the various means of providing ATP for...Ch. 10 - Explain why athletes who excel at short sprints...Ch. 10 - Explain why skeletal muscle generates the most...Ch. 10 - Prob. 18DYKBCh. 10 - Describe the response of smooth muscle to...Ch. 10 - Prob. 20DYKBCh. 10 - Prob. 1CALCh. 10 - One of the primary reasons that one individual is...Ch. 10 - Prob. 3CALCh. 10 - Rigor mortis occurs following death because a....Ch. 10 - Prob. 5CALCh. 10 - Prob. 1CSLCh. 10 - Describe the effect of the botulinum toxin, which...Ch. 10 - Smooth muscle is within the urinary bladder wall....
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