Heroin: what does this substance do to the body's nervous system?!

When heroin enters the body, it travels to the brain and it easily attaches to the endorphin-receptor sites on nerve endings due to the similar molecular makeup. The brain then begins to go into a state of analgesic or a state where pain cannot be felt.

Heroin is a powerful copy of morphine, which is a barbiturate. Morphine is a natural occurring substance in the opium poppy that is a powerful pain reliever and barbiturates are sedative drugs that slow down the activities of the CNS. Large doses cause hostility and anxiety. Other effects are slurred speech, loss of coordination and difficulty staying awake.
The overall effect of heroin is a depression of the central nervous system.

In tobacco smoke, nicotine "rides" on small particles of tar. When the smoke with this nicotine/tar mixture gets to the lungs, the nicotine is absorbed quickly - nicotine reaches the brain about eight seconds after the smoke is inhaled. American cigarettes contain about 9 mg of nicotine, but because much of the nicotine is burned off, a smoker gets about 1 mg of nicotine in every cigarette. Nicotine reaches the central nervous system in about 3-5 minutes when tobacco is chewed.

Smoking can be stimulating or relaxing - it depends on a person's mood and dosage of nicotine. Nicotine acts on the central and peripheral nervous system. The rapid effects of nicotine include: pain

* Increases in blood pressure and heart rate
* Faster respiration
* Constriction of arteries
* Stimulation of the central nervous system.




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