In Rigor Mortis

Question

In rigor mortis
A) the myosin heads are attached to actin.
B) ATP is depleted.
C) calcium ions keep binding to troponin.
D) sustained contractions occur.
E) All of the answers are correct.

Accepted Answer

Rigor mortis is a post-mortem condition characterized by the stiffening of muscles due to changes in the biochemical processes within muscle cells. During rigor mortis, ATP is depleted, preventing the detachment of myosin heads from actin, which causes muscles to remain in a contracted state. Calcium ions also play a role in this process, as their continued binding to troponin contributes to the sustained contractions observed. Thus, all of the statements accurately describe aspects of rigor mortis.