Stiffening of body muscles after death due to ATP depletion: COMEDK 13
**Core Concept**
The underlying principle being tested is the process of **rigor mortis**, which is the stiffening of the body muscles after death. This occurs due to the depletion of **adenosine triphosphate (ATP)**, the energy currency of the cell.
**Why the Correct Answer is Right**
Rigor mortis is caused by the lack of ATP, which is necessary for the relaxation of muscles. When ATP is depleted, the muscles contract and become rigid. This process typically begins within 2-4 hours after death and can last for several days.
**Why Each Wrong Option is Incorrect**
**Option A:** Not provided, assuming it's not related to ATP depletion or muscle stiffening.
**Option B:** Not provided, assuming it's not the correct term for the process.
**Option C:** Not provided, assuming it's not related to the stiffening of body muscles after death.
**Option D:** Not provided, assuming it's not the correct term for the process.
**Clinical Pearl / High-Yield Fact**
Rigor mortis is an important post-mortem change that can be used to estimate the time of death. It's also a classic example of the consequences of **ATP depletion** on muscle function.
**Correct Answer:** Rigor mortis.