1. Which of the following statements is true about negative feedback inhibition?
A. It works on the pituitary gland but not the
hypothalamus.
B. It contributes significantly to the maintenance of
homeostasis.
C. It works in opposite fashion to a thermostat.
D. It works in only one direction.
Check Answer

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.