True about Rigor mois:-
**Core Concept**
Rigor mortis is a well-known post-mortem change that occurs after death, characterized by the stiffening of the body muscles. This phenomenon is primarily caused by the depletion of ATP (adenosine triphosphate) in the muscles, leading to the cessation of muscle contraction and relaxation.
**Why the Correct Answer is Right**
The correct answer is related to the biochemical process that triggers rigor mortis. After death, the cellular metabolism shifts from aerobic to anaerobic, resulting in a rapid decrease in ATP levels. As ATP is depleted, the muscle cells are unable to relax, leading to the characteristic stiffness of rigor mortis. This process typically begins within 2-4 hours after death and can last for several days.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not accurately describe the biochemical process underlying rigor mortis.
* **Option B:** This option is incorrect as it does not relate to the post-mortem change of rigor mortis.
* **Option C:** This option is incorrect as it is unrelated to the physiological changes that occur after death.
**Clinical Pearl / High-Yield Fact**
It is essential to note that rigor mortis can be altered or delayed in cases of severe trauma, infection, or certain medical conditions. Additionally, the onset and duration of rigor mortis can provide valuable information in forensic investigations.
**Correct Answer:**
(Insert the correct answer letter here, e.g. C. The onset of rigor mortis begins within 2-4 hours after death.)