phys 32.txt

What is chronotropicity?

Rhythm, SA node
What is Dromotropocity?

conduction, AV node
What is inotropocity?

contraction, ion concentration
What do the left SNS affect in the heart?

contraction
What do the right SNS affect in the heart?

conduction (AV) and rhythm (SA)
What do the pre/postganglionic SNS fibers release?
- Pre = Ach
- Post = NE
What hormone does the adrenal gland release?

Epinephrine
What nerve does the PNS course with to get to the heart?

Vagus Nerve, CN X
What is the pre/postganglionic hormone of the PNS?

Ach
What does the R/L vagus nerve contact in the heart?
- R = SA
- L = AV
What G protein does the Symp/Para pathway activate in the heart?
- Sym = Gs (stimulator)
- Para = Gi (inhibitor)
What is the function of Atropine?

Antagonist for M2 = increased HR
What is the function of Propranolol?

B1 antagonist = decreased HR

Author

kepling

64129

Card Set

phys 32.txt

Description

phys 32

Updated

2011-02-04T21:48:23Z

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