Fill in the blank with the best possible answer.

1		Releasing factors from the control many other endocrine organs.
2		Hormones that are released can only act on their .
3		Steroid hormones exert their effects by the cell.
4		All hormones secreted by the anterior pituitary are classified as hormones.
5		The cascade of events that results in changing second messenger concentrations involves a special protein called a(n) .
6		Regulation of a hormone by monitoring blood plasma concentrations of a particular substance is called regulation.
7		A hormone level rises and causes a decrease in its releasing factor. This is an example of .
8		Special neurons involved in the release of hormones are called cells.
9		permits the release of thyroxine.
10		The hypophyseal pass through the infundibulum carrying releasing factors.
11		targets bone, muscle, and adipose tissue causing increases in size.
12		The gland releases calcitonin.
13		PTH targets in bone tissue.
14		has a direct effect on blood volume.
15		The sex hormones are classified as hormones.