Question

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neurotransmitters travel across the __ to bind to receptor sites on the __ of the nearby receiving neurons.
synapse; terminal buttons
synapse; dendrites
dendrites; cell body
myelin sheath; terminal buttons
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the endogenous opioid peptides, commonly known as ____, elevate mood, reduce pain, and can make us feel closer to others.
endorphins
morphine
antagonist drugs
analgesics

Explanation:

1. Neurotransmitters cross the synapse, the small gap between neurons, to bind with receptor - sites on dendrites of the receiving neuron. Terminal buttons are at the end of the axon of the sending neuron, not the receiving one. Dendrites receive signals.
2. Endogenous opioid peptides are known as endorphins. Morphine is an exogenous opioid. Antagonist drugs block receptor sites. Analgesics are pain - relieving drugs in a general sense, not the specific name for endogenous opioid peptides.

Answer:

1. B. synapse; dendrites
2. A. endorphins