When animals die muscles stiffen in rigor mortis because 1 a

When animals die, muscles stiffen in rigor mortis because

1. actin and myosin cannot bind without ATP.
2. actin and myosin cannot separate without ATP.
3. ATP forms cross-bridges between filaments.

Solution

Answer : The correct answer is 2 (actin and myosin cannot separate without ATP).Explanation : After the death, ATP synthesis stops as breathing stops. However, so the crossbridges cannot detach from actin. The resulting condition, in which muscles are in a state of rigidity( cannot contract or stretch) is called rigor mortis.