Answer to Question #234818 in Human Anatomy and Physiology for moe

Question

6.What are the two kinds of postsynaptic potentials 

Answer 1

Synapse is a joint in which two neurons are in contact with each other and easy transfer of impulse takes place .

It is divided into three membrane :- 

A ) Pre - synaptic membrane 

B ) Synaptic cleft 

C ) Post- synaptic membrane 

Presynaptic membrane :- 

It is a neural membrane above the synaptic cleft from which contain synaptic vesicle for storing neurotransmitter .Neurotransmitter are then released via exocytosis process .

Synaptic cleft :- 

Synaptic cleft is present in between presynaptic and post synaptic membrane .

Post Synaptic membrane :- 

The membrane of post synaptis contain many receptor to which neurotransmitter can attach .It is involved in catches signal impulses.

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Change in membrane potential takes place , once neurotransmitter enter post synaptic membrane . Post synaptic potential is of two types :- 

A ) Excitatory postsynaptic potential ( EPSP) 

B ) Inhibitory postsynaptic potential. ( IPSP ) 

A ) Excitatory postsynaptic potentials :- 

When Excitatory neurotransmitter attach to post synaptic membrane , sudden opening of sodium and calcium channel occur which cause inward entry of both positive ions inside . This results in depolarisation.

B ) Inhibitory postsynaptic potentials( IPSP ) :- 

When inhibitory neurotransmitter attach to post Synaptic membrane , potassium and chloride channel open causes removal of potassium and inward entry of chloride ions .This results in hyperpolarization.

 

Conclusion :- 

Post synaptic potential is divided into two potential :-:

A )Excitatory postsynaptic potential ( EPSP) 

B ) Inhibitory postsynaptic potential ( IPSP)