Rigor mortis that occurs in skeletal muscles a few hours after death is due to
A) excessive ATP,and decreased membrane permeability to calcium ions.
B) lack of ATP,and increased membrane permeability to calcium ions.
C) persistent stimulation by motor neuron.
D) a decrease in the number of muscle fibers.
E) None of the choices are correct.

Question

Quizplus · Accepted Answer

Rigor mortis occurs due to lack of ATP, which is needed for muscle relaxation. Without ATP, the myosin heads remain bound to actin filaments, resulting in the state of stiffness known as rigor mortis. Additionally, the lack of ATP leads to increased membrane permeability to calcium ions, which further contributes to muscle contraction and stiffness.

Rigor Mortis That Occurs in Skeletal Muscles a Few Hours