| 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) |
|
|
Ch.18 LTI-MA 509
