Autonomic Nervous system Flashcards
M1 receptor location
Sweat glands and the CNS
M1 receptor mechanism
Gq
Gq effects
activate PLC to produce IP3 and DAG. Increases calcium and activates protein kinases.
M2 receptor location
Heart, presynaptically.
M2 receptor mechanism
Gi
Gi effects
inhibits adenylyl cyclase, opens potassium channels and hyperpolarizes the cell.
M3 receptor locations
Ciliary muscle, iris circular muscle, endothelium, bronchioles, bladder, sphincters, GI.
M3 receptor mechanism
Gq
Nicotinic Nn receptor locations
postganglionic neurons and presynaptic terminals
Nicotinic Nm receptor locations
skeletal muscle
Nicotinic mechanism
Increases Na influx and depolarizes the cell
Alpha 1 receptor locations
Iris radial muscle, skin vessels, penis
Alpha 1 receptor mechanism
Gq
Alpha 2 receptor locations
GI smooth muslce, presynaptically
Beta 1 receptor locations
Heart, kidney.
Beta 1 receptor mechanism
Gs
Gs effects
Stimulates adenylyl cyclase causing depolarizaiton
Beta 2 receptor locations
Skeletal muscle vessels, bronchioles, bladder, liver
Beta 2 receptor mechanism
Gs
Beta 3 receptor locations
lipocytes
Beta 3 receptor mechanism
Gs
D1, D5 receptor locations
brain and renal vascular bed
D1, D5 receptor mechanism
Gs
D2, D3, D4 receptor locations
brain and other tissues
D2, D3, D4 receptor mechanism
Gi
Alpha 1 on the iris
Contracts the radial muscle. Causes Mydriasis.
M3 on the iris
Contracts the circular muscle. Causes Miosis.
Beta on the lens
Relaxes ciliary muscle to accommodate far vision.
M3 on the lens
Contracts the ciliary muscle to accommodate for near vision.
M3 on intraocular pressure
Decreases IO pressure
Alpha 1 on intraocular pressure
Decreases IO pressure
Beta on intraocular pressure
Increases IO pressure
Beta 1 on the heart
Increases HR and contractility
M2 on the heart
Decreases HR ad contractility
Alpha on blood vessels
vasoconstriction of skin and splanchnic vessels
Beta 2 on blood vessels
vasodialtion of skeletal muscle vessels
Beta 2 on bronchioles
bronchodilates
M3 on bronchioles
bronchoconstricts
alpha 2 on GI tract
Relaxes
Beta 2 on GI tract
Relaxes
M3 on GI tract
contracts
alpha 1 on GI sphincters
contracts
M3 on GI sphincters
relaxes
M3 on gastric secretions
Increases
Beta 2 on bladder
relaxes
M3 on bladder
contracts
Alpha 1 on bladder sphincter
contracts
M3 on bladder sphincter
relaxes
Beta 2 on uterus
relaxes
Alpha on penis
Ejaculations
M on penis
Erection
M on eccrine glands
increases
alpha on apocrine (stress) glands
increases
Beta 3 on fat cells
lipolysis
Beta 1 on kidneys
increased renin release
Beta 2/alpha on liver
gluconeogenesis and glycogenolysis