Which of the Following Is the Definition of "Upregulation

Multiple Choice

Which of the following is the definition of "upregulation"?

A) An increase in hormone receptors in response to low hormone levels
B) An increase in hormone receptors in response to high neurotransmitter levels
C) The increase in hormone levels produced by an increase in hormone receptors
D) The decrease in hormone levels produced by a decrease in hormone receptors
E) A change in hormone levels in response to a change in receptor levels