why do body decompose only when we are dead?

Answer 1

They don't. Aging IS decomposing.

Answer 2

Because when a person is dead, all bodily functions cease. Hence, blood no longer circulates to nourish every cell in the body and therefore, all cells die slowly. When that happens, the body gives off a smell that bacteria, flies, and all other organisms belonging to the group called "decomposers" to feed on it.

Got that from watching too much CSI. LOL...

Answer 3

As I understand it, your body is decomposing, but at the same time your DNA is creating new proteins that replace the old cells. Evidence would be shedding skin cells and hair. I'm poor at medical science so I could be totally off-base on this one.

Answer 4

There is no more oxygen or food to keep the body's tissues alive.

The second reason is, that we have living bacteria (which is a GOOD kind), that eats the bacteria that would otherwise kill us, by eating us when we're alive.

When we die, so does our normal fauna and flora. Our bodies natural defense die too. They rely on our food and oxygen to survive. The harmful bacteria is just another food source.
Our white blood cells play a huge role in this as well. They eat the dangerous parasites. But, once we die, they too die also.

The harmful bacteria stays in our body after we die. It doesn't NEED living tissue to survive, so it eats us.

The decay is caused by bacteria and other microscopic parasites that can survive on living or dead tissue.

It continues to feed off of our dead flesh until there is nothing left but our skeleton.

Answer 5

Because the cells without blood can't regenerate so the body just perishes. Our cells decompose from the day we r born but they r replaced with new cells and as we get older our ability to regenerate cells is weaker and when we die we stop regenerating.

Answer 6

because what prevents our body to decompose is the presence of spirit in our body, that after death it will go out of the body...and the body without spirit would be decomposed.

Answer 7

because the body when living has special cells that keeps you from decomposing

Answer 8

All of the cells the make up your body are constantly multiplying and making new cells. The old cells die off and leave the body (like skin cells, which naturally slough off). There is oxygen and nutrients in your blood which is carried through your body to all of the cells to keep them going. When you die you organs shut down and the blood stops flowing and carrying the nutrients. Without the nutrients and oxygen the cells can no longer rejuvenate and die off, resulting in decomposition.

Answer 9

any source of life has its own ascending, laying, and descending period of time.as the human body is a source of life, has such an biodegradable evolution, so it is in a process of decomposing, as during the life-time,as after death.don't forget about the bacterias that " eat" he human body after death because there is no energy to support the "flame of being".

Answer 10

My mum's decomposing. She's still alive, i think. Smells bad too.