Autonomics (CIS) Flashcards
What organ ultimately delivers the response for the sympathetic or parasympathetic system
The brain
What receptor does the sympathetic NS act on in the SA node and what does this do physiologically
B1
Increases the slope of stage 4 by increasing the Na(f) allowing for faster build-up to depol and faster HR
What does sympathetic NS act on in phase 2 of the ventricle myocyte
Increases Ca into myocyte which increases contractility and increases SV
How does the sympathetic NS act on skeletal muscles
What receptor and what physiologically
Increases blood flow to the skeletal muscles by acting on B2 receptors which cause a relaxation and dilation in BV and thus more blood flow to the muscles
How does sympathetic NS act on the skin, salivary glands, etc.
Divert blood flow away via (a) receptors which vasoconstrict
In general for visceral muscles, what to (a) and B receptors do
.(a) - constricts
B - relaxes
What two ways does the sympathetic NS act on the eye
- dilated pupils via (a1) which causes constriction of radial muscle of the eye
- Relax ciliary muscle for far vision via B2 receptor which flattens the lens
What receptor does the sympathetic NS act on for broncho dilation
B2
What two ways does the Sympathetic NS act on the liver
- (A) and B increase glycolysis which allows for more free glucose for use in skeletal muscle
- lipolysis via B receptors which allows for more FFA for use in other cells
What receptors act via Sympathetic NS in the pancreas to allow for decreased insulin production
(A) receptors
What thee ways does the Sympathetic NS act on the gut
- Decreased intestinal peristalsis via B receptors
- Increased sphincter activity and closure via (a) receptors
- Decreased secretions via (a) receptors
What comes before contraction
Conduction
