Exogenous and endogenous opioids have both similar and varying effects. Choose the statement that correctly summarizes their differences.
A. Exogenous, but not endogenous, can block transmissions of pain.
B. Naloxone has been shown to block the proven actions of both exogenous and endogenous opioids.
C. Like exogenous opioids like morphine, endogenous opioids cause strong feelings of euphoria.
D. Endogenous are found in the CNS, whereas exogenous are released from neurons in the PNS.
Answer: B
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