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Chapter 38: Q.35 (page 1121)

How would muscle contractions be affected if ATP was completely depleted in a muscle fiber?

Short Answer

Expert verified

Myosin heads will detach rapidly from the actinbinding sites, resulting in muscle relaxation.

Step by step solution

01

Step 1. Introduction

ATP Adenosine triphosphate is an organic compound that provides energy to drive many processes in living cells, such as muscle contraction, nerve impulse propagation, condensate dissolution, and chemical synthesis.

02

Step 2. Explanation 

If ATP was completely depleted in a muscle fiber then the muscle would relax and lengthen because ATP is required for myosin to release from actin, muscles would remain rigidly contracted until more ATP was available for the myosin cross-bridge release. This is why dead vertebrates undergo rigor mortis.

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Most popular questions from this chapter

The deadly nerve gas Sarin irreversibly inhibits Acetylcholinesterase. What effect would Sarin have on muscle contraction?

Which of the following statements about bone tissue is false?

a. Compact bone tissue is made of cylindrical osteons that are aligned such that they travel the length of the bone.

b. Haversian canals contain blood vessels only.

c. Haversian canals contain blood vessels and nerve fibers.

d. Spongy tissue is found on the interior of the bone, and compact bone tissue is found on the exterior

What factors contribute to the amount of tension produced in an individual muscle fiber?

Synchondroses and symphyses are:

  1. synovial joints
  2. cartilaginous joints
  3. fibrous joints
  4. condyloid joints

Which of the following statements about muscle contraction is true?

  1. The power stroke occurs when ATP is hydrolyzed to ADP and phosphate.
  2. The power stroke occurs when ADP and phosphate dissociate from the myosin head.
  3. The power stroke occurs when ADP and phosphate dissociate from the actin active site.
  4. The power stroke occurs when Ca2+ binds the calcium head.
See all solutions

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