Question

12 how is an impulse transmitted from one neuron to another? multiple choice a neurotransmitter traveling from postsynaptic axons crosses the synapse to presynaptic dendrites or a cell body an impulse stimulating a presynaptic axon causes the release of neurotransmitters into a synaptic cleft. a neurotransmitter traveling from presynaptic dendrites crosses the synapse to postsynaptic axons or a cell body an impulse stimulating presynaptic dendrites causes the release of neurotransmitters into a synaptic cleft

Explanation:

When an impulse reaches the end of a presynaptic neuron (at the axon terminal), it causes the release of neurotransmitters into the synaptic cleft. The synaptic cleft is the small gap between the presynaptic and postsynaptic neurons. Neurotransmitters then bind to receptors on the postsynaptic neuron (which can be on dendrites or the cell body) to transmit the signal. Dendrites are mainly for receiving signals, not for releasing neurotransmitters (so options with dendrites releasing neurotransmitters are wrong). Also, neurotransmitters travel from presynaptic (sending) neuron to postsynaptic (receiving) neuron, not the other way around as in the first option.

Answer:

An impulse stimulating a presynaptic axon causes the release of neurotransmitters into a synaptic cleft.