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Human Body Systems

TermDefinition
Homeostasis to maintain a balanced or constant internal state; when the external conditions change
musculoskeletal system the system of bones and skeletal muscles that support and protect the body and permit movement
circulatory system the organs and tissues involved in circulating blood and lymph through the body
respiratory system A system of organs, functioning in the process of gas exchange between the body and the environment, consisting especially of the nose, nasal passages, nasopharynx, larynx, trachea, bronchi, and lungs.
digestive system Breaks down food into absorbable units that enter the blood for distribution to body cells.
excretory system the system that removes waste from your body and controls water balance
nervous system the network of nerve cells and fibers that transmits nerve impulses between parts of the body
reproductive system Reproduce offspring- produce male sex cells (sperm) and female sex cells (oocytes)
immune system a complex response system that protects the body from bacteria, viruses, and other foreign substances
Pathogen a bacterium, virus, or other microorganism that can cause disease
antibody a substance produced by the body that destroys or inactivates an antigen that has entered the body
immunity the ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells
vaccine substance prepared from killed or weakened pathogens and introduced into a body to produce immunity
Virus A tiny, nonliving particle that invades and then reproduces inside a living cell
Bacteria single-celled organisms that lack a nucleus; prokaryotes
Fungi Kingdom composed of heterotrophs; many obtain energy and nutrients from dead organic matter
infectious disease A disease that is caused by a pathogen and that can be spread from one individual to another.
noninfectious disease A disease that cannot spread from one individual to another
antibiotic A chemical that kills bacteria or slows their growth without harming body cells.
antiviral drugs Drugs that act, are effective, or are directed against viruses
Created by: KellyKirvin
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