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Livor Mortis is the stiffening of muscles are death due to chemical changes in muscle fibers.

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Final answer:

Rigor mortis is the stiffening of muscles after death due to the absence of ATP, resulting in the inability to move body parts. In a live person, a similar condition is referred to as "writer's cramp".

Step-by-step explanation:

Rigor mortis is the stiffening of muscles after death due to the absence of ATP, which normally allows the myosin heads to detach from the actin-binding sites, resulting in muscle relaxation. In a live person, this process is called "writer's cramp", while in a recently deceased person it results in rigor mortis. ATP is necessary for the myosin heads to detach from the actin-binding sites, and once ATP is depleted after death, the muscle becomes rigid.

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