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B
brain
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C
gastrointestinal tract
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D
all of the above
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Solution
The correct option is D all of the above Opioids are a class of drugs naturally extracted from the latex of Papaver somniferum plant. Morphine and heroin are two most highly addictive opioids.
Opioids are administered either orally or intravenously, they bind to the receptors in the body and slow down or decrease body functions.
Opioid receptors are abundantly found in the brain and cardiac tissue. On binding with these receptors they bring about a decrease in heart rate, blood pressure and respiratory rate. It also brings about decreased responsiveness, slow movements and poor state of awareness.
These are also found in the gastrointestinal tract, and stimulation of these receptors slows down the motility of the gut and decreases water movement as well. This results in hardened stools and leads to constipation.
Hence, opioid receptors are found in all the mentioned options.