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

The membranes have specific receptors, you're welcome :).

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.