(a) Mention the scientific name of the source plant and the part from which opioids are extracted. [1]

(b) How are morphine and heroin related? Mention the effect each one of them has on human body. [2]

Q: (a) Mention the scientific name of the source plant and the part from which opioids are extracted. [1] (b) How are morphine and heroin related? Mention the effect each one of them has on human body. [2]

Opioids are drugs obtained from the **opium poppy** and act on the central nervous system as depressants. **(a) Source plant and part:** - **Scientific name:** *Papaver somniferum* (opium poppy). - **Part:** extracted from the **latex** of the **unripe (green) fruit / capsule** of the plant. **(b) Relationship and effects:** - **Relationship:** **Heroin** (diacetylmorphine, commonly called *smack*) is obtained by the **acetylation of morphine** — chemically, heroin is a derivative of morphine. - **Effect of morphine:** a powerful **sedative and painkiller (analgesic)**; medically used to relieve severe pain, e.g. after surgery. - **Effect of heroin:** a **depressant** that **slows down body functions**; it is white, odourless and bitter, and is a highly addictive drug of abuse. Both bind to specific opioid receptors in the central nervous system and gastrointestinal tract.

Human Health and Disease

Opioids — Morphine and Heroin

Official Answer

Opioids are drugs obtained from the opium poppy and act on the central nervous system as depressants.

(a) Source plant and part:

Scientific name: Papaver somniferum (opium poppy).
Part: extracted from the latex of the unripe (green) fruit / capsule of the plant.

(b) Relationship and effects:

Relationship: Heroin (diacetylmorphine, commonly called smack) is obtained by the acetylation of morphine — chemically, heroin is a derivative of morphine.
Effect of morphine: a powerful sedative and painkiller (analgesic); medically used to relieve severe pain, e.g. after surgery.
Effect of heroin: a depressant that slows down body functions; it is white, odourless and bitter, and is a highly addictive drug of abuse.

Both bind to specific opioid receptors in the central nervous system and gastrointestinal tract.

opioidsPapaver somniferumopium poppylatex of unripe capsulemorphineheroinacetylationdepressant analgesic

Marking Scheme

1(a) 1 mark: ½ for scientific name Papaver somniferum + ½ for latex of unripe fruit/capsule.
2(b) 1 mark: heroin is obtained by acetylation of morphine (heroin is a derivative of morphine).
3(b) 1 mark: effect of each — morphine = sedative/painkiller (analgesic); heroin = depressant that slows down body functions (½ + ½).

Hint

Opium poppy = Papaver somniferum; opioids come from the latex of the unripe capsule. Heroin = acetylated morphine; both are CNS depressants/painkillers.

Quick Oral Answer

Opioids come from the latex of the unripe capsule of the opium poppy, Papaver somniferum; heroin is acetylated morphine, morphine acts as a sedative and painkiller while heroin is a depressant that slows down body functions.

Analysis & Explanation

Concept:

Opioids are a class of narcotic drugs that bind to opioid receptors present mainly in the CNS and gut, producing depressant, pain-relieving effects.

Chemical link:

Morphine is the natural alkaloid isolated from opium latex.
Heroin is a semi-synthetic derivative made by acetylation (diacetylation) of morphine, which makes it far more potent and addictive.

Exam trap:

The part is the latex of the unripe (green) capsule/fruit — not the seeds or the ripe fruit.
Students often reverse the relationship; remember heroin is made from morphine, not the other way round.

Real-world:

Morphine is a legitimate, life-saving analgesic in medicine, while heroin has no medical use and is a major drug of abuse — illustrating how the same source plant yields both a medicine and a dangerous narcotic.

Common Mistakes

1Writing that opioids are extracted from the seeds or ripe fruit — they are extracted from the latex of the unripe (green) capsule.
2Reversing the relationship by saying morphine is made from heroin; heroin is the acetylated derivative of morphine.
3Calling opioids stimulants — morphine and heroin are CNS depressants, not stimulants like cocaine.

Interesting Facts

The species name 'somniferum' literally means 'sleep-bringing', reflecting the sedative action of opium.

Morphine was first isolated by Friedrich Sertürner around 1804 and named after Morpheus, the Greek god of dreams.

Heroin (diacetylmorphine) was first synthesised in 1874 and was briefly marketed by Bayer in 1898 as a cough suppressant before its extreme addictiveness was recognised.

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Frequently Asked Questions

From which part of the opium poppy are opioids obtained?

Opioids are obtained from the latex (milky exudate) of the unripe green fruit or capsule of Papaver somniferum. The latex is dried to form crude opium, from which alkaloids such as morphine are extracted.

Is morphine a legal drug?

Morphine has legitimate medical use as a strong analgesic to relieve severe pain, so it is used legally under strict medical supervision. Heroin, its acetylated derivative, has no accepted medical use and is an illegal drug of abuse.