When Animals Die,muscles Stiffen in Rigor Mortis Because

Question

When animals die,muscles stiffen in rigor mortis because
A) muscles cannot contract without ATP.
B) actin and myosin cannot bind without ATP.
C) ATP is required for synthesis of protein filaments.
D) ATP forms cross-bridges between filaments.
E) actin and myosin cannot separate without ATP.

Accepted Answer

Rigor mortis occurs because ATP is required for the separation of actin and myosin filaments after a muscle contracts. Without ATP, these filaments remain bound, causing the muscles to stiffen.