Q. What is Rigor Mortis? Ans. Click Here Q. What causes Rigor Mortis? Ans. Chemical changes in the muscles after death result in rigor mortis.  Muscle transverse tubules, a part of the sarcoplasmic reticulum, release calcium ions when action potentials delivered by the nerves reach their target muscles. The concentration of calcium ions within a … Continue reading What Causes Rigor Mortis?