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.

Answered by Wiktoria F. Biology tutor


See similar Biology A Level tutors
Illustration of a video tutorial

Need help with Biology?

One to one online tuition can be a great way to brush up on your Biology knowledge.

Have a Free Meeting with one of our hand picked tutors from the UK’s top universities

Find a tutor

Related Biology A Level answers

All answers ▸

What is the difference between competitive and non competitive inhibitors?

Describe the process of extracellular digestion

What are the key ideas surrounding homeostasis?

Describe how insulin is secreted from beta cells in the Islets of Langerhans

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 2013–2022

Terms & Conditions|Privacy Policy