Explain how a synapse between two neurons functions

When impulse arrives at pre-synaptic terminal, the depolarisation opens the voltage-gated Ca2+ ion channels. This causes Ca2+ to enter synapse due to differences in concentration. This causes the vesicles to bind to the membrane, open, and release the neurotransmitters into the cleft. Neurotransmitters diffuse across cleft to the post-synaptic membrane. They bind to receptors on ligand-gated ion channels. When acetylcholine is the neurotransmitter, it opens Na+ ion channels. The influx of Na+ ions in post synaptic neuron depolarises the membrane and causes a new action potential to form. This is an excitatory response. Neurotransmitter detaches from receptor, is broken down by enzymes, and is reabsorbed back into pre-synaptic membrane.

Answered by George B. Biology tutor

2236 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Which mechanisms control the homeostasis of blood sugar levels in the human body? How do these regulate the concentration of sugar in the blood?


Describe the structure of DNA


(b) Cigarette smoke contains nicotine. Nicotine is a vasoconstrictor that reduces the diameter of some blood vessels. (i) Using this information, explain why smoking increases the risk of developing cardiovascular disease (CVD). How do I approach this?


Name the first stage of respiration. How many net ATP molecules are produced?


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