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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

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.

The ability of a muscle to generate tension immediately after stimulation is dependent on:

  1. myosin interaction with the M line
  2. overlap of myosin and actin
  3. actin attachments to the Z line
  4. none of the above

All of the following are groups of vertebrae except ________, which is a curvature.

  1. thoracic
  2. cervical
  3. lumbar
  4. pelvic

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

The pectoral girdle consists of the:

a. clavicle and sternum

b. sternum and scapula

c. clavicle and scapula

d. clavicle and coccyx
See all solutions

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