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17., , Cancer., , aGeneral, , Account., , many humans, the most dreaded diseasennd is the major causc of death of, contact With other cell, Connct inhibition is the proporty of normal cells, by virtue of which, their uncontrolled growth; cancer cells have lost this properiy, inhibits, tumours,, l he uncontrolled proliferation of cancerous cells produces masses of cells, called, , ancer, , 1s, , Tumours are of two types:, , Benign, , Tumours, , They, remain confined to their original location and do not spread to other parts; they, cause little damage., , iMalignant Tumours., are masses of neoplastic/proliferating cells, which grow rapidly, invade and, damage the surrounding normal tissues/cells., These, cells compete with the normal cells for vital nutrients and disrupt the normal, metabolism., Ahese cells show the property of metastasisS, , They

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white, it is a bitter, hite, odourless crystallin, morplhine;, dincetyl, (smack) is chemically, acctylation of morplhine., oWs down, Compound obtained by, injection; 1t 18 a depressant and slo, and, snorting, by, taken, leroin is generally, body functions,, , Heroin, -, , CH, , Fig.8.4 Morphine, , Ahnabinoids, These, , are a/group, , B-C), , O, , Fig.8.5 A Cannabinoid- Skeleton, , of chemicals, which interact with canpnabinoid, , receptors present, , nainly, , in the bran., , cannabinoids are obtained from the inflorescence/fiower tops of Cannabis sa, producerd, Manjuana, hashish, ganja and charas are the different forms of cannabinoids, by, Cannabis, of, and, leaves, plant., tops,, resin, flower, combinations, various, of, These are taken by inhalation and oral ingestion., Phey affect the cardiovascular system of the body., They are abused by sportspersons in recent times., Coca Alkaloids/Cocaine, Cocaine, commonly called coke or crack is obtained from Erythroxylon coca., eocaine interferes, with the transport of the neurotransmitter, dopamine., is usually taken by smoking., A has a potential stimulating action on the central nervous system and produces a sense, Eof euphoria and increased energy; excessive dosage causes hallucinations, , Natural, , in, , t, , Hallucinogens., , e, , 7, , Products from plants like Atropa belladong and Datura spp. are hallucinogenic., LSD Lysergic acid Diethylamide) is obtained from a fungus.Mereella), Tobacco. [ Niestyana tahacu, Tobacco is usually chewed or smoked or used as snuff. 33, contains mainly nicotine, which is a stimulant and, lt, toxin., Nicotine, , stimulates the adrenal gland to release, adrenaline and nor-adrenaline whic, increase the blood pressur and heart rate., ASmoking of tobacco increases the chances of lung cancer,, bronchiti, emphysema, coro, heart diseases, cancer of throat, gastric, ulcer, cancer of urinary bladdr, etc., Smoking of tobacco also increases the carbon, monoxide content of blood and reau ces, concentration of haem-bound oxygen,, thus causing oxygen deficiency, in the body., Chewing of tobacco causes oral cancer., , uAlcohol., Alcohol is a depressant., It, , affects the central nervous system.