During LTP, calcium enters postsynaptic NMDA receptors which leads to an increase in the number of postsynaptic AMPA receptors.
Thisius known as Long-term potentiation and is the process which involving persistent strengthening of synapses.
It is activated by calcium ions and helps to produce an increase in signal transmission between neurons.
Read more about Long-term potentiation here https://brainly.com/question/14879971