That is why I had asked you to make it simple, instead of all useless jargon.<quoted text>
Expectedly, you've failed to understand the deeper rationale.
BTW, life in a living being is not due to the life-force proper but it is on account of the pentuple currents of the lower aspect of the life force infused in the physical energies.
This infused aspect of the lower range of the life-force into the gross physical energies is called the physico-vital consciousness force and it is this combination of forces that animates or enlivens the body.
Once the physico-vital force quits the body it falls into a cataleptic or corpse-like state but the subtler life-force, mind force and psychic being do not quit the body for 7 days after it enters this condition - clinical death - and only somewhere around the 7th day does this melange of finer consciousness-energies quit the body leaving it an empty shell and so burial is better than cremation as the former method of disposal of the body leaves it intact without disturbing the finer indwelling forces that remain within the force field of the body for 7 days after the escape of the physico-vital force that in clinical parlance is called death. Cremation compels the indwelling finer forces to quit the body in a highly disturbed state and this then adversely affects the condition of these finer forces in the disembodied condition.
I will make it simpler for you, 5th Grader!
When all the organs stop functioning, the body is considered dead and is ready for disposal.