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It may work so hard that it temporarily loses its natural rhythm.

This is called fibrillation, and it can be very dangerous because it stops the flow of blood through the body.

For example, anabolic steroids can weaken the immune system -- the body's defense against germs and diseases.

They can also lead to liver damage or cancer, even in young people.

Most Schedule V drugs are available over the counter.

Taking drugs by injection can increase the risk of infection through needle contamination with staphylococci, HIV, hepatitis, and other organisms.

Parts of the brain that influence mood and are involved in learning and memory are called the limbic system. In animals, they have been shown to impair learning and memory.

They can also lead to changes in mood, such as feelings of depression or irritability.Normally, once dopamine has attached to a nerve cell's receptor and caused a change in the cell, it's pumped back to the neuron that released it.But cocaine blocks the pump, called the dopamine transporter.Cocaine Cocaine causes the body's blood vessels to become narrow, constricting the flow of blood. It forces the heart to work harder to pump blood through the body.(If you've ever tried squeezing into a tight pair of pants, then you know how hard it is for the heart to pump blood through narrowed blood vessels.) When the heart works harder, it beats faster.Maybe you've even seen an anabolic steroid user develop bigger muscles over time.

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