Chapter 22- Introduction to microbiology and human disease Flashcards
Define bacteria
simple, single-celled organism.
found in freshwater, saltwater, soil, and other living organism.
Define viruses
they are not cells; smaller and simpler in structure compared to bacteria and paracites- since they only reproduce only within the living cells of a host.
Define Protoza
single-celled animals, such as amoebas.
free living in freshwater or saltwater, they consume bacteria, fungi and each-other.
define Fungi
unicellular or multicellular. they decompose organic matter in the soil and freshwater and help recycle nutrients.
Define worms
multicellular animals
free living within the soil they consume dead organic matter or smaller living things.
define arthropods
(joint lefts) multicellular animals such as lobsters, and shrimp. Some insects are vectors of disease- they spread pathogens from host to host when they bit.
Define the process of binomial nomenclature
scientific names have 2 parts: binomial nomenclature.
name = genus and species.
genus= larger category and Capitalized
Species= second category and not capitalized.
what is normal Flora-microbiota?
natural population of microorganisms living in us.
categorized into resident flora (species that live on or in nearly everyone at all times ) or transient flora (species found periodically on or in the body.
What is a resident flora that turned to an opportunist?
bacteria that live in one area of the body and are harmless, but they can end up in other parts of the body and be harmful.
Term means “ harmless species that has become a pathogen in special circumstances”
How does a microorganism cause an infection?
enter and establish itself in a host and begin reproducing.
What is the term given for the ability of a pathogen to cause a disease
virulence
what is host resistance?
the total of the body’s defences against pathogens.
what are examples of human body defences?
intact skin
mucous membranes
sweeping of cilia in respiratory tract
describe the distribution of normal Flora-Microbiota in the human body specifically the skin.
exposed to the environment, large bacterial population and small number of fungi.
describe the distribution of normal Flora-Microbiota in the human body specifically the nasal cavities.
bacterial, mold spores, and viruses enter.
chiliated epithilium limits microbial population by sweeping mucus and trapping pathogens in the pharynx to be swallowed.
describe the distribution of normal Flora-Microbiota in the human body specifically the trachea, bronchi, and lungs
cilia of the trachea and large bronchial tubes sweep mucus and microbes upwards towards to pharynx where they are swallowed.
those that base are destroyed by alveolar macrophages
describe the distribution of normal Flora-Microbiota in the human body specifically the oral cavity
large bacterial and small number of yeast and protozoa. kept in check by lysosyme, (saliva), resident flora help prevent growth of pathogens
describe the distribution of normal Flora-Microbiota in the human body specifically the esophagus
contains microorganism swallowed with saliva or food
describe the distribution of normal Flora-Microbiota in the human body specifically the stomach
hydrochloric acid kills most bacteria,
describe the distribution of normal Flora-Microbiota in the human body specifically the small intestine
ileum has the largest bacteria population, the duodenum has the smallest
describe the distribution of normal Flora-Microbiota in the human body specifically the large intestine
contain enormous population of bacteria, which inhibits the growth of pathogens and produces vitamins.
describe the distribution of normal Flora-Microbiota in the human body specifically the urinary bladder
virtually free of bacteria, lower urethra has flora similar to that of the skin
describe the distribution of normal Flora-Microbiota in the human body specifically the vagina
large bacterial population that creates an acidic pH that inhibits the growth of pathogens.
Imbalance of bacterial usually results in Yeast infections
describe the distribution of normal Flora-Microbiota in the human body specifically the tissue fluid
small number of bacteria and viruses penetrate mucous membranes or get thorugh breaks of skin. Most destroyed by lymph nodules of lymph nodes or by wandering macrophages in tissue fluid.
describe the distribution of normal Flora-Microbiota in the human body specifically the blood
should be free of microorganism
what are clinical and subclinical symptoms?
clinical= apparent or symptomatic subclinical = innaparent or asxs
what do you call the time prior to symtpoms appearing once a pathogen has established itself in a host.
incubation period.
some dieases are specific periods, and others are variable.
what is the prodromal period?
short time period that may follow the incubation period
> here vague, non-specific sxs may begin and are very generalized.