HELP 15 POINTS The main function of the respiratory system is .

A) the carrying of nutrients to body cells
B) the exchange of gases between the body and the environment
C) the prevention of diseases caused by pathogens
D) the elimination of wastes from the body

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.