1) Describe the 2 major types of extracellular chemical messengers.
2) Answer the following questions about hormones.
a. give examples of water-soluble hormones.
b. give examples of lipid-soluble hormones
c. which type of hormone can freely travel in blood?
d. which type of hormone requires a carrier protein to move through blood?
3) What are the characteristics of messenger-receptor binding?
a. where are the receptors for gene expression located in the target cell for
a water-soluble extracellular messenger?
b. where are the receptors for gene expression located in the target cell for
a lipid-soluble extracellular messenger?
4) How are hormone receptors regulated?
a. what is up-regulation?
b. what is down-regulation?
5) Compare and contrast the endocrine system and the nervous system.
6) Describe how hormones are controlled and regulated.
7) List the 3 parts of the nervous system that are controlled by the hypothalamus.

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