Name an opioid drug and its source plant. How does the drug affect the human body?

Explanation

(a) Opium is the most common opioid obtained from the dried latex of unripe capsules of white poppy plant-Papaver somniferum.
(b) Effects of opium - opium acts as depressant and analgesic so lessens pain, reduces tension, lowers blood pressure and respiration rate, and reduces visual activity. Its overdose may block respiration and cause death.