What is the input of matter during the process of gas exchange?

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.

This connective tissue consists of large round densely packed cells with the nucleus pushed to one side.

What organelle makes protein for use outside the cell?