Transmission of Acetylcholine






Transmission of Acetylcholine

Mechanism of Synaptic Transmission

Acetylcholine Receptor



Acetylcholine is transmitted at the nerve-muscle junction by cholinergic nerves. Cholinergic nerves are part of the parasympathetic nervous system. 

Taken from:



The parasympathetic system is part of the Autonomic Nervous System (ANS), which is comprised of two antagonistic nerves; the sympathetic and parasympathetic systems. 

 The parasympathetic system is concerned with the conservation and restoration of energy. It is responsible for causing reductions in heart rate and blood pressure, and it facilitates digestion and the absorption of nutrients, it is consequently responsible for the excretion of waste product. 

An overview of the responsibilities of the two systems is shown below:

Function Sympathetic System Parasympathetic System
Heartbeat Increases Decreases
Pupil Size Dilates Constricts
Salivation Decreases Increases
Bronchioles Dilates Constricts
Digestive Juices Inhibits Stimulates
Tear Ducts No comparable effect Increased secretion of tears
Bladder Relaxes Constricts