What is the role of calcium in synaptic transmission?

Calcium is found as an ion, Ca2+ in the extracellular space of the pre-synaptic neuron. The ions enter the neuron through voltage -gated channels after the depolarisation of the pre-synaptic neuron. This causes an influx of calcium ions which help sacs filled with neurotransmitters move to the membrane facing the synaptic cleft. These sacs fuse with the plasma membrane and exocytosis takes place, by which a chemical message is sent to the post-synaptic neuron. The calcium ions are then actively transported out of the neuron to restore the chemical gradient in time for the next depolarisation.

WF
Answered by Wiktoria F. Biology tutor

17181 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

What is the function of ATP and explain how is it suitable for its function


"Describe the process of Aerobic Respiration"


What is the electron acceptor used in photosynthesis


Describe the problems that arise due to cystic fibrosis. Describe why cystic fibrosis occurs, with reference to its deficient gene. Describe the use of liposomes and viruses in treating cystic fibrosis


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences