1. Hormones and the Endocrine System
Chapter 45

2. Overview Read the Overview section and answer the following questions:
1. List 5 examples of how hormones function
2. What substances do hormones travel in?
3. What cells do hormones affect?

3. 45.1 ~Endocrine vs. Nervous system
Differences
Nervous system: high speed electrical signals along neurons.
Endocrine: slower longer-acting responses that secrete directly into blood.
Similarities
Neurosecretory cells
Epinephrine (fight-or-flight hormones & neurotransmitter)

4. Feedback loops
Negative feedback – the effector response reduces the initial stimulus and eventually the response ceases
Positive feedback – reinforces the stimulus and leads to an even greater response
Nursing mother

5. Basic hormone control pathways

6. 45.2 ~ Signaling pathway
3 major classes of molecules function as hormones
Proteins & peptides
Amines
Steroids (NOT water soluble)
All 3 types signal using the signal transduction pathway
Reception
Transduction (affect target cells)
Response

7. Water soluble vs. lipid soluble signaling

8. Location of Endocrine Glands