Final answer:
Both naloxone and nalorphine have effects similar to morphine, as they are opioids that reduce pain and produce euphoria.
Step-by-step explanation:
Both naloxone and nalorphine are endogenous chemicals that have effects similar to morphine. These chemicals belong to a category of drugs called opioids, which also includes heroin, methadone, and codeine. Opioids have analgesic properties, meaning they decrease pain. The human body produces small quantities of opioids that bind to opioid receptors and reduce pain and produce euphoria. So, the statement that naloxone and nalorphine have effects similar to morphine is true.