Question

__________are the chemicals that facilitate the flow of electrical impulses from one neuron to the next across nerve synapses; and the presence or absence of both serotonin and noradrenaline have been linked to aggressive behavior in human beings.

Answer 1

Answer:

Neurotransmitters

Explanation:

Neurotransmitters are chemicals synthesized in neuron and bloodstream and move to distal sites where they functions by transmitting signals across a synaptic junction, from one neuron to another.

Answer 2

Answer:

Neurotransmitters

Explanation:

Neurotransmitters are the chemicals that are released from the axon terminals of the pre-synaptic neurons of the synapse. These chemicals have receptors at the surface of the dendrites of postsynaptic neurons of the synapse. Binding of neurotransmitters to their receptors brings about the excitatory or inhibitory effect on the postsynaptic neuron. Accordingly, the action potential is fired. In this way, electrical signals are passed from one neuron to the next at the synapse. Acetylcholine is an example of neurotransmitters.