1. Take out a sheet of paper for a new page of notes
1/28/19
Take out a sheet of paper for a new page of notes
Page 33
EQ: What is the physiology of hormones?
Open your notes to page 31.
I will be stamping your questions on page 30

2. Lets Review from Friday:
There are two types of Hormones
Amino acid based (proteins)
Steroids
Each hormone, regardless of which type, only works with specific target cells
How do they work though?
PLAY
InterActive Physiology®: Endocrine System: Orientation

3. Amino acid/Protein hormone action (simplified)
Hormone binds to a cell membrane receptor
This complex binds to another protein in the membrane
This binding process activates a second messenger and in some cases a third messenger
The second or third messengers then trigger a response in the cytoplasm of the cell

4. Steroid Action (simplified)
Steroids cross the cell membrane
They travel through the cytoplasm and enter the nucleus
They then turn on genes (DNA) which then creates a cellular protein (protein synthesis)

5. How are hormones regulated?
New EQ:
How are hormones regulated?

6. Control of Hormone Release
Blood levels of hormones:
Are controlled by negative feedback systems
A negative feedback is a system that stops the production of a molecule
PLAY
InterActive Physiology®: Endocrine System: Biochemistry, Secretion, and Transport of Hormones