Once a Structure Is Fully Grown and Mature, It Will

Multiple Choice

Once a structure is fully grown and mature, it will probably

A) up-regulate its receptors for growth hormone, as it no longer receives as much of the ligand.
B) up-regulate its receptors for growth hormone, as it no longer needs to continue to grow at a fast rate.
C) down-regulate its receptors for growth hormone, as it no longer receives as much of the ligand.
D) down-regulate its receptors for growth hormone, as it no longer needs to continue to grow at a fast rate.