Rigor Mortis is the sign after death. It occurs due to

Appeared in: UPPSC 2022

Explanation

Rigor mortis is defined as the post-mortem stiffening of the body's muscles.
This occurs because after death, cellular metabolism stops, and the supply of Adenosine Triphosphate (ATP) is depleted.
ATP is necessary for muscle relaxation; without it, the contractile proteins (actin and myosin) become locked in a contracted state, causing the muscles to become rigid.

Option A: This describes Algor Mortis, which is the process of the body cooling down to the ambient temperature after death.
Option B: The cessation of blood circulation is the cause of Livor Mortis (post-mortem lividity), where blood pools in the dependent parts of the body due to gravity, causing a purplish-red discoloration.
Option D: This describes the processes of autolysis and putrefaction, which are later stages of decomposition where the body's tissues break down due to enzymes and bacterial action.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Post-mortem changes and signs of death as background academic context rather than a clinical decision trigger.
Understanding the signs of death is crucial for nurses to confirm death, estimate the time of death, and provide appropriate post-mortem care.
Knowledge of rigor mortis helps in positioning the body before it sets in, ensuring the deceased is handled with dignity and respect. For example, closing the eyes and mouth and placing dentures should be done before rigor mortis fully develops.
These signs are also fundamental in forensic medicine to help establish a timeline in investigations.

How to Approach the Question

First, identify the key term in the question, which is 'Rigor Mortis'.
The question asks for the definition or the direct result of this process.
Analyze each option to see which one correctly defines or describes rigor mortis.
Option A describes body cooling (Algor Mortis).
Option B describes the cause of blood pooling (Livor Mortis).
Option C describes body stiffening, which is the definition of rigor mortis.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor pp. 951-953, 946-948

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