What happens immediately after death?

When we die, our heart stops pumping the blood. This deprives our cell of oxygen. Cell need oxygen to stay alive and when they don't get it, they begin to broke down and die at varying rates depending upon the type of cells. For example, our brain cells die within few minutes while skin cells survive 24 hours after death. In the absence of oxygen, excess carbon di oxide builds inside the body and causes acidic environment. This acidic environment causes the membranes in our cells to rupture. The membrane releases the cells from the inside out. This is the first stage of human decomposition, known as autolysis or self-digestion which begins immediately after death. If you have ever seen the dead person, you may noticed that the skin looks ashen. Blood circulation helps the skin getting color. When it stops circulating, the skin will get a grayish tint. Immediately after death, our body temperature about 1.5 degree fahrenheit per hour until it reaches room temperature. This phase is known as death chill. After that the stiffness sets in the limbs, eyelids, jaw, neck muscles.
                                                     
                                                     Our body hosts several micro organisms. While our cells die relatively short after death but the bacteria in our intestines do not. These micro organisms eat up the body. As the microbes work away, gases begin to accumulate in the intestine and the surrounding tissues expand. Internal organs develop into gas and liquids. In this stage, the liquid pour out all orifices and gases can cause the skin to rupture. A week after death, our body's skin will blister so much that the slightest touch will cause it to fall off. Insects and animals certainly notice all of these and they feed on the body, helping it to break down even further. The skin blackens and along with the breakdown comes the rancid smell. This stage occurs anywhere from 10 to 25 days after the death. After 25 to 50 days, the insects complete the breaking down of soft tissues, skin and hairs as well as the muscles and connective tissues inside the body. And finally there is absolutely nothing left but skeleton. After that our body is slowly broken down over thousands of years. Our body is used as fuel by micro organisms and their body will do the same. While life for the individual may be over, the cycle of life goes on.