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GED Life Science

Lesson 4 Health Issues

infection the invasion of the body by germs-microorganisms that cause disease
bacteria a germ that is one-celled that can cause infection; can often be treated with an antibiotic
virus a germ that replicates only within the cells of living hosts, mainly bacteria, plants, and animals; generally useless to treat with an antibiotic
immune system a network of interacting cells, cell products, and cell-forming tissues that protects the body from pathogens and other foreign substances, destroys infected and malignant cells, and removes cellular debris
antibodies molecules that bind with a foreign antigen and disable it; signals other immune defenses
immunization a protection against specific infectious disesases
antibiotics drugs that fight bacteria
nutrients substances needed for growth, normal functioning, and maintenance of cells; we get them from the food we eat
Needed nutrients for humans proteins, carbohydrates (sugars and starches), fats, vitamins, minerals, and water
drugs substances that affect the structure or function of the body
drug abuse nonmedical use of a drug to the point that it interferes with a person's normal functioning
addiction a severe form of dependence that causes physical changes in the body so that when the drug wears off or is stopped, withdrawal symptoms such as nausea and pain occur
psychological dependence (habituation) a type of dependence in which the urge to take the drug is strong even though there are no withdrawal symptoms (marijuana and hallucinogens)
inhalants substances (such as glue, gasoline, aerosols) that are sniffed for their effect on the nervous system (they slow the functioning of the nervous system and can cause their users to lose control or become unconscious)
Created by: jpiittmann