Can the cells in our bodies talk with each other? They do when we exercise

When we exercise, far-flung parts of our bodies apparently communicate with one another, thanks to tiny, particle-filled balloons that move purposefully through the bloodstream from one cell to another, carrying pressing biochemical messages, according to an important new study of the biology of exercise.
 
The study helps to clarify some of the body-wide health effects of working out and also underscores just how physiologically complex exercise is.
 
For some time, scientists have suspected that the body’s internal organs are as gossipy and socially entangled as any 8th-grade classroom. It is thought that, under the right conditions, fat cells