When your organs don't receive enough blood, they begin to

They began to get damage.

Explanation:

A life-threatening situation in which the organs receive low oxygen is known as a shock. This eventually results in organ damage and at certain occasions death. In the condition, the blood pressure becomes extremely low. The shock takes place due to many reasons like insufficient pumping activity of the heart, low blood volume, or excessive dilation of the blood vessels.  

The people generally go in shock when their blood pressure becomes very low, so low that the cells of the body do not get adequate blood supply and thus do not attain a sufficient amount of oxygen. As a consequence, the cell of the organs like kidneys, brain, heart, and liver stop to work normally. If the restoration of blood does not take place quickly, the organs become damaged and die eventually.  

a- all cells come from pre-existing cells