SNS Control of F(h) Flashcards
1
Q
What are the 3 sites of epinephrine and norepinephrine release?
A
- chromaffin tissue outside of heart (EP)
- heart in cyclostomes + lungfish (EP)
- adrenergic nerves (NP, EP)
2
Q
What is the chromaffin tissue outside of the heart?
A
- head kidney in fish (like adrenal cortex)
3
Q
What are target sites of SNS control?
A
- SA and AV
4
Q
What does SA stand for?
A
- sinoatrial
5
Q
What does AV stand for?
A
- atrioventricular
6
Q
What is the action of SNS control in MOST fish hearts + us?
A
- B-receptors –> (+)chronotropy and (+) inotropy (increase heart rate)
7
Q
What is the action of SNS control in SOME fish hearts?
A
- a-receptors –> (-) chronotropy
- decreases heart rate
