Cholinergic Drugs (Exam 1) Flashcards
What is a neuron made up of?
- Cell body or soma
- Dendrites
- Axon
Dendrites
Receive signals from other neurons
Axon
Sends out signal to surrounding neurons through axon terminal
Action Potential
Electrical signal that travels down axon
Created using Na+, Inhibited by K+
Depolarization
Voltage gated Na+ channels open
Na+ influx
Repolarization
Voltage gated Na+ channels close and K+ channels open
K+ efflux
Hyperpolarization
Voltage gated K+ channels close
Increased signaling occurs from drugs that…?
- Increase concentration of neurotransmitter at synapse
- Activate postsynaptic receptors
Decreased signaling occurs from drugs that…?
- Decrease concentration of neurotransmitter at synapse
- Decrease activation of postsynaptic receptors
Relationship between cholinergic signaling and heart rate
Inverse relationship
Increase cholinergic signaling, decrease heart rate
Relationship between adrenergic signaling and heart rate
Direct relationship
Increase adrenergic signaling, increase heart rate
Cholinergic
Acetylcholine (Ach) neurotransmitter
Cholinergic Receptors
Nicotinic (N1, N2)
Muscarinic (M1-M5)
Cholinomimetics
Enhance cholinergic signaling
Anticholinergics
Reduce cholinergic signaling
Synthesis of Ach
Synthesized from Acetyl-S-CoA and Choline by choline acetyltransferase (ChAT)
Sympathetic Nervous System
Fight or flight
Parasympathetic Nervous System
Rest and digest
Nicotinic Receptors (N)
Nn and Nm
Nn Receptor
Ganglia
Adrenal medulla
Nm Receptor
Neuromuscular
Muscarinic Receptor (M)
M1, M2, M3, M4, M5
M1 Receptor
Gastric
Ganglia
CNS
M2 Receptor
Heart
CNS
M3 Receptor
Eye
GIT
Bladder
Bronchus
Glands
CNS
M4 Receptor
CNS
M5 Receptor
CNS
Nicotinic Ach Receptor Properties
- 5 subunits , 2 bind Ach
- Opens ion channels, K+ out Na+ in
- Acetylcholinesterase stops signal