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8 Cards in this Set

  • Front
  • Back
What branch are systemic arterioles innervated by?
What branch are juxtaglomerular cells (secrete renin) innervated by?
What branch is heart ventricular tissue innervated by?
Mostly sympathetic, partly parasympathetic
How does the combination of para/sympathetic innervation balance heart rate?
-Parasympathetic vagus nerve suppresses SA node activity, reducing heart rate
-Cardiac sympathetic nerve stimulates SA node activity, increasing heart rate

-AV node impulses are suppressed by parasympathetic activity, stimulated by sympathetic activity
How does the combination of para/sympathetic activity balance airway resistance?
-Bronchioles innervated by parasympathetic neurons, not sympathetic
-PNS nerves stimulate bronchioles to constrict

-EPI from bloodstream relaxes and opens bronchioles
What is the effect of alpha adrenoceptor activation on intestinal smooth muscle?
-Relaxation of smooth muscle lining intestines, inhibiting propulsive movements
-This is atypical as usually activation of alpha adrenoceptors causes increased tonic contraction
What type of receptors do sympathetic cholinergic neurons activate on their effector cell?
M receptors, even though the nerve is anatomically sympathetic (in that it comes from a certain region of the spine)
In what three ways is the adrenal medulla an atypical effector?
1) Innervated by preganglionic, not postganglionic neurons

2) These neurons are sympathetic but cholinergic because they are preganglionic

3) Though they are effector cells, the receptors on their surface are Nn, not M