Which Best Describes "Rigor Mortis

question 67

Multiple Choice

Which best describes "rigor mortis"?

• A) Lack of ATP following death causes cross-bridges to remain tightly bound to actin.
• B) Lack of ATP following death causes calcium to remain in the cytosol, continuously stimulating cross-bridge cycling.
• C) Repeated, high-frequency action potentials to a skeletal muscle fiber causes sustained contraction following death.
• D) Following death, calcium-activated proteases degrade all proteins in skeletal muscle fibers, making muscles limp.
• E) Build-up of K⁺ in T-tubules causes constant, tetanic contractions of skeletal muscles that last for about 12 hours following death.

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