Describe the events that occur at synaptic junction that result in an action potential in the post synaptic membrane.

An action potential arrives at the pre synaptic membrane which initiates the opening of Ca2+ channels. The influx of Ca2+ ions will cause vesicles containing neurotransmitters to fuse with the pre-synaptic membrane. The neurotransmitters will leave the pre-synaptic membrane via exocytosis and diffuse across the synaptic clef. The neurotransmitters will bind to complementary receptors on the post-synaptic membrane. Binding of neurotransmitter to the receptor cause the ligand-gated Na+ channels on the post-synaptic membrane to open , allowing Na+ to move into the post-synaptic membrane. The entry of enough Na+ ions will depolarise the post synaptic membrane and an action potential will be generated.

SB
Answered by Samantha B. Biology tutor

3332 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Discuss the bonds which comprise the tertiary structure of protein.


What is ATP? Explain its structure, synthesis and function.


Explain the structure of a Protein and how this can relate to its function.


How is blood glucose concentration regulated, with reference to insulin, glucagon and the liver?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences