Neurotransmitters Flashcards
Acetylcholine
Receptors: Cholinergic
Can be muscarinic (glands) or nicotinic (motor end plate)
M1 receptor
muscarinic. excitatory. decreases K+ conductance and increases IP3 and DAG (which increases Ca2+)
M2 receptor
muscarinic. inhibitory.
increases K+ conductance and decreases cAMP.
Are nicotinic receptors excitatory or inhibitory?
excitatory at the motor end plate. increase cation conductance
Norepinephrine
Receptors: Adrenergic
a1, a2, and B
a1 receptors
adrenergic (NE). excitatory. decrease K+ conductance and increase IP3 and DAG (which increases Ca2+)
a2 receptors
adrenergic (NE). inhibitory.
presynaptic a2 receptors decrease Ca2+ conductance
postsynaptic a2 receptors increase K+ conductance and decrease cAMP
B receptors
adrenergic (NE). can be inhibitory or excitatory. function through GCPRs coupled through increased cAMP
Dopamine
Receptors: dopaminergic
D1 and D2.
responsible for reward, motivation, pleasure, and renal blood flow
D1 receptors
dopaminergic. excitatory.
D2 receptors
dopaminergic. inhibitory. presynaptic D2 receptors decrease Ca2+ conductance.
postsynaptic D2 receptors increase K+ conductance and decrease cAMP
what two enzymes are needed to make dopamine?
Tyrosine –tyrosine hydroxylase—> DOPA —dopamine decarboxylase–> Dopamine
Serotonin
Receptors: Serotonergic
5-HT1A, 5-HT2A, 5-HT3A, 5-HT4A
Responsible for anger, vomiting, and sexuality
5-HT1A receptors
serotonergic. inhibitory. increases K+ conductance and decreases cAMP conductance
5-HT2A receptors
serotonergic. excitatory. decreases K+ conductance and increases IP3 and DAG (which increase Ca2+)
5-HT3A receptors
serotonergic. excitatory. increases cation conductance
5-HT4A receptors
serotonergic. excitatory. Decreases K+ conductance