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ANS INNERVATES
Question | Answer | Question | Answer |
---|---|---|---|
2 subdivisions? | Parasympathetic (PNS)Sympathetic (SNS) | Neurotransmitters? | Receptor type determines which neurotransmitter will act on target cells |
Prime goal of the ANS? | maintain homeostasis | 2 classes of ANS receptors? | Cholinergic-respond to Ach.Adrenergic-respond to Norepi |
what happened at rest, and after feeding? | PNS dominates control | where is Adrenergic Receptors 2 subclasses located? | Alpha, Beta |
what happend during activity and stress? | SNS dominates control | Properties of Alpha Adrenergic Receptors | Located in effector organs of sympathetic nervous systemMost commonUsually excitatoryAffinity greater for norepinephrine than epinephrine |
Parasympathetic Activity | Quiet, relaxed statesActive in “rest and digest”Increase gastrointestinal activitiesDecrease heart rate and blood pressure | Beta Receptors | Act on Gprotein systems to increase cAMP activityCan be activated by both norepi and epi |
Sympathetic Activity | Fight-or-flight response | ||
how many neurotransmitters secreted at target cells? | 2 of them (PNS-Acetylcholine (Ach)SNS-Norepinephrine (Norepi)Cells that secrete Ach-cholenergicCells that secrete Norepi-adrenergic) |