Endocrine Mechanisms Homework Help!?

Hello all! I need help with some of my anatomy homework! Thanks in advance:)

1) A chemical messenger that is produced by neurons but functions like a hormone circulating in the blood would be a

a. neurohumor
b. neurotransmitter
c. neuromodulator
d. neurohormone

2) Secretion of cortisol is triggered by the anterior pituitary hormone ACTH.  High blood levels of cortisol act on the anterior pituitary to inhibit ACTH release.  This is an example of:

a. neural stimulus for secretion
b.paracrine hormone secretion
c. a second messenger system
d. negative feedback
e. positive feedback

3)Down regulation:

1. results in a decrease in the number of receptor sites in the target cell
2. results in an increase in the number of receptor sites in the target cell
3. produces an increase in the sensitivity of the target cell to the hormone
4. produces an decrease in the sensitivity of the target cell to the hormone

a. 1,3
b. 2,4
c. 2,3
d. 1,4

4) Cyclic adenosine monophosphate is the most common

a. second messenger
b. paracrine
c. neurohormone
d. circulating hormone
e. steroid hormone

5) Which of the following is an intracellular molecule that catalyzes phosphorylation as its major function?

a.protein hormone
b.protein kinase
c. cyclic AMP
d.adenyl cyclase
e. steroid hormone

THANKS AGAIN IN ADVANCE