Which statement or statements describe why depletion of ATP after death leads to rigor mortis?

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN:9781305967359
Author:STARR
Publisher:STARR
Chapter32: Structural Support And Movement
Section: Chapter Questions
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Which statement or statements describe why depletion of ATP after death leads to rigor mortis? 

Select all that apply.

  
ATP is required to move tropomyosin back over the active sites of thin filaments.
  
ATP is required for myosin thick filaments to detach from actin thin filaments.
 
ATP is required to pump calcium back into the sarcoplasmic reticulum.
 
ATP is required for the action potential to spread across the sarcolemma.
 
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