Here are the effects of some drugs in the central nervous system:

Stimulants increase the production of neurotransmitters in the brain’s synapses. It increases the blood pressure, heart rate, and breathing rate, which often leads to an energized feeling.

Depressants decrease the brain’s function rate. It prevents the nerve cells to start action potentials, which leads to a calming and relaxing effect on the individual. It decreases blood pressure, heart rate, and breathing rate, which causes the relaxation of muscles and relief from tension.

Cocaine releases dopamine in the brain. It produces a feeling of extreme pleasure and satisfaction which makes it very addictive.

Opiates mimic the effect of endorphins in the brain. As a result, it helps overcome the feeling of pain.

Drugs can affect a person’s body in many different ways and these substances can alter the nervous system’s function in one or more of these ways:

1. A drug can cause an elevation in the number of neurotransmitters that is released into a synapse.
2. A drug can block a receptor site on a dendrite hence preventing neurotransmitter binding.
3. A drug can prevent a neurotransmitter from escaping a synapse
4. A drug can imitate a neurotransmitter.

**Stimulants** are drugs that elevate alertness and physical activity. It increases the amount of dopamine released into a synapse. On the other hand, **depressants** are responsible for the slowing down of the CNS, and causes lower blood pressure, breathing interruption, and slower heart rate.

**Cocaine** causes a sudden release of dopamine neurotransmitters, thus its abuse may cause the disruption in the heart rhythm that may result in heart attacks, chest pain, and respiratory failure. On the other hand, **opiates** act as a depressant, and releases the endorphin neurotransmitter that can cause drowsiness, nausea, and restlessness.

A drug is a substance or a medicine which causes an effect in a body’s physiological processes once consumed by an individual.

because drinking impairs judgement and slows down the reaction time of a person.

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Psychological-dependent addiction is harder to break because the body will think that it will not function properly without the drug. So the person will have to keep taking the drug in order to live and function. Psychological addiction can be broken by the person deciding not to continue taking the drug.