Final answer:
The statement that livor mortis remains constant once set is false, as it can be influenced by external factors and eventual decomposition.
Step-by-step explanation:
The statement that once completely set, livor mortis remains constant in the body is false. Livor mortis, also known as post-mortem lividity, refers to the purplish-red discoloration that appears on the lowermost parts of a cadaver, resulting from the pooling of blood under the influence of gravity. This process is generally fixed between 10 to 12 hours after death. However, it can be influenced by various factors such as temperature and pressure on the body. For instance, in a dry environment, the desiccation of tissues can affect the appearance of livor mortis. Furthermore, livor mortis is not observable in internal organs which remain intact nor in areas where individual hairs or other aspects can obscure the pooling of blood, nor is it perpetual - eventual decomposition alters the appearance.