After a hormone enters the bloodstream, it is transported throughout the body, but the hormone affects only certain cells. only certain cells are affected because the membranes of these cells have what specific structures?

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing