Rigor mortis occurs after a person dies because muscle cells are no longer supplied with ATP. This causes the muscles to become rigid and stuck in position. Based on your knowledge of muscle contraction, why would muscles become rigid, rather than limp, after death

When they stop receiving energy in the form of ATP, the muscle fibers and sarcomeros stagnate in one position and hypertrophy, that is why sometimes post-mortem facial expressions are very noticeable since the facial muscle was not relaxed. .

On the other hand, it is not only the energy source that stops being supplied due to systemic failure but also due to the accumulation of gaseous collection by decomposition that makes movements impossible and stagnates the joints and muscular structures.

Explanation:

Rigor mortis is an irreversible systematic tetanization that occurs in all the dead, there are no exceptions.

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.