Biology 107

Study Guide: Chemical signals I.

Chapter 45

1. What is the difference between endocrine and exocrine glands? Which secrete hormones?
2. Define paracrine and autocrine signaling.
3. How may a single type of molecule have completely different effects on different tissues?
4. What types of signaling molecules must bind to receptors on a cell surface? What types of signaling molecules can enter the cell and bind to a intracellular receptor? What type of cellular event does a signaling molecule:intracellular receptor complex often initiate?
5. What are the endocrine organs in humans?
6. How does the source of hormones secreted from the posterior pituitary differ from those secreted from the anterior pituitary?
7. What is a tropic hormone?
8. What hormones are secreted from the posterior pituitary? What hormones are secreted from the anterior pituitary? What are the functions of each?