Question

Chemical communication between neurons is characterized by:

a) the release of neurotransmitters from the presynaptic terminal that then moves across
b) the synaptic cleft to bind to receptors on the postsynaptic cell depolarization of the axonal membrane by na ions to move the signal down the axon an influx of k into the axon that makes
c) the axonal membrane more negative the release of ca2 ions from the presynaptic terminal that then move to the nucleus and cause the release of neurotransmitters through the postsynaptic cell

Answer 1

Chemical communication between neurons involves the release of neurotransmitters that bind to receptors on the postsynaptic cell, resulting in depolarization or hyperpolarization. This process is triggered by the entry of Ca²+ ions into the presynaptic cell.

Step-by-step explanation:

Chemical communication between neurons is characterized by the release of neurotransmitters from the presynaptic terminal that then moves across the synaptic cleft to bind to receptors on the postsynaptic cell. This process involves the depolarization of the presynaptic membrane, the opening of voltage-gated Ca²+ channels, and the entry of Ca²+ ions into the cell. The Ca²+ entry triggers the fusion of synaptic vesicles with the membrane, allowing the release of neurotransmitter molecules into the synaptic cleft.

The neurotransmitter diffuses across the synaptic cleft and binds to ligand-gated ion channels in the postsynaptic membrane, resulting in a localized depolarization or hyperpolarization of the postsynaptic neuron.