How is a nerve impulse transmitted across a synapse?
A synapse is gap between two neurones. When a nerve impulses travels along the axon reaches the end of the pre-synaptic neurone, the release of chemical messengers (called neurotransmitters) is triggered. These molecules diffuse across the synapse and bind to receptors on the postsynaptic neurone. Here, they cause a response and cause the nerve impulse to be transmitted along the second axon.
MD
Related Biology A Level answers
All answers ▸What is the difference between DNA and RNA?
Putting bee honey on a cut kills bacteria. Honey contains a high concentration of sugar. Use your knowledge of water potential to suggest how putting honey on a cut kills bacteria.
Explain the structure of an amino acid and how a peptide bond forms between two amino acids.
What is phagocytosis and what steps are involved?