| http://www.w3.org/ns/prov#value | - mpulse is generated ??? ??? ??? When an action potential reaches the axon terminal of a neuron, it triggers the release of chemical messengers called is called a neurotransmitter ??? ??? ??? Endorphins are released in the brain in response to pain or vigorous exercise ??? ??? ??? The autonomic nervous system controls internal functions, such as heart rate and glandular activity.
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