Chemical Message

Frog Heart Experiment 

Otto Loewi: Vagus nerve and the neurotransmitter acetyl choline 

Acetyl choline slows heart rate

Acetyl Choline: First Neurotransmitter discovered in PNS and CNS. 

The Chemical Synapse 

Presynaptic neurons have synaptic vesicles with neurotransmitters 

Postsynaptic have receptors

Neurotransmitters bind to receptors - Ion channels are triggered to open 

Neurotransmitters In Chemical Synapse

Fast Chemical Synapse

Slow Chemical Synapse

Fast Chemical Synapse VS Slow Chemical Synapse

Fast Chemical Synapse contain ionotrophic receptors 

(Ligand gated ion channels)

Slow chemical synapses contain metabotrophic receptors

 (G protein coupled receptors)

Types Of Chemical Signalling

Chemical Synapse VS Electrical Synapse 

Snapshot (Chemical Message)

Attraction Is Chemicals Talking To You

Attraction: Dopamine