How does heroin cause addiction?Introduction:Heroin is an illegal Class A drug that occurs primarily in the form of powdered opium. It is made from poppy resin. Opium is extracted from the pod and then refined into morphine (the synthetic form of heroin) and then heroin. An estimated 9.2 million people worldwide use heroin. Heroin is extremely addictive. Addiction occurs when a person uses a substance or engages in an enjoyable activity. However, after prolonged consumption, normal life becomes disrupted and possibly dangerous. Drug use begins with an investigation and therefore a test of the drug. After the first use, the medicine can start to be taken regularly and the use of the medicine thus becomes a habit: some time after the first try you become tolerant (the pleasant effects are diminished). After some time, you become dependent: this means that the medication is necessary for your feeling of regularity. Eventually you become addicted and the drug addiction spirals out of control. There are many obvious symptoms: When you're addicted to a drug, it can mean powerful cravings and uncontrollable use. So, when the quantity of drug is low, the person may have physical sensations and emotional withdrawal problems. Additionally, a symptom of addiction could be an obsession with how you can receive the substance. Two more common symptoms are: excessive use and difficulty controlling life away from the substance: relationships can break down and lives can erode. Addiction makes you lose all awareness of what is happening around you that is not part of your desire. As a result, people and things around you that you were once very close to (family, school, etc.) become isolated. Heroin has many physical and psychological effects......middle of paper......outside the cell. This is called the resting potential. Following an adjustment in the concentration of sodium and potassium ions in the cell: there is a change in the permeability of the cell membrane, causing sodium channels to open, allowing sodium ions to enter the cytoplasm with the concentration gradient, causing the membrane to become depolarized. As soon as the depolarization reaches the threshold level, an action potential is created. Neurons can also communicate chemically. This occurs when an action potential reaches the axon terminal. As a result, voltage-gated calcium channels open and therefore calcium enters the cell. The calcium then sends a signal to the vesicles which then travel towards the membrane. Then, neurotransmitters are released by exocytosis. The neurotransmitters then bind to the receptors after diffusing across the synaptic cleft.