How the Nervous System works and How Drugs Affect It
The nervous system is the control system and the network of communication for the body. All of our thoughts, and behavior can be traced to the activity of a neuron. A typical neuron has three important parts: first a cell body, second dendrites and last an axon. All three parts are important for our daily functions. Drugs however such as cocaine can alter these actions and have short and long term effects that aren't always the best feeling. . The nervous system is made up of nerves, the spinal cord and the brain. The nerves control everything we do; they carry messages that tell us to move, to breathe, to feel and to think. Nerves run to the muscles, organs, heart, lungs, blood vessels, brain-even to our teeth and skin. Neurons are the specialized cells that conduct impulses through the nervous system. There are about 100 billion neurons in just the brain. A neuron has three parts that make it up, a cell body, which carries metabolic functions, dendrites being branched fibers which are the primary receivers of the impulses from other neurons, and axons that are slender tail
The action potential operates according to the "all or none" law a neuron either fires completely or it doesn't fire at all. The main way it affects the body is by changing the neurotransmitters. Cocaine constricts the blood vessels, raises blood pressure, speeds up the heart, quickens respiration and can cause seizures. Neurons that are negative charged are not firing which is called resting potential. They know it's easier to stay away from drugs than to withdraw from them after they have become addicted. The synapse is where the axon of a sending neuron joins the receiving neuron across the synaptic cleft. Physical drug dependence for instance is a craving or irresistible urge for a drug's pleasurable effects. and when you are really have sensitivity to it it is related to some cases of schizophrenia. If somebody starts altering their nervous system the brain will adjust and then get that person addictive the drug causing the alterations. If you never do it, then you'll never know what your getting away from. Users who begin with cocaine in powder form are likely to progress to crack(rock form of cocaine). It also is considered the most addictive drug of all addictive drugs. When drugs change these transmitters, all the problems begin.
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