Exam 1: Intro Flashcards
Symbiosis
two dissimilar organisms living together
commensalism
relationship between two dissimilar organisms where one benefits without affecting the other
mutualism
relationship between two dissimilar organisms where both benefit
parasitism
non-mutual symbiotic relationship between species, where one species (the parasite) benefits at the expense of the other, the host
taxonomy
classification of organisms based on common characteristics
species is defined by
morphology, biology, genetics, and the ability to interbreed
divisions of classification of organisms are
kingdom, phylum, class, order, family, genus, and species
wide range of hosts is termed
euryoxenous
narrow range of hosts is termed
monoxenous
the severity of dz is usually directly related to
the number of parasites present
economic parasitism
the level of infection where the host may appear normal but is less able to gain weight, produce wool, hair, milk, run faster than others, or any other factor which makes the host noncompetitive with its genetic equals
clinical parasitism
the level of infection where the level of parasitism may be sufficient to cause overt disease or even death of the host
what affects parasitic disease in hosts
genetic factors (males more susceptible than female) sex of the host host behavior age of an animal environmental factors
what are ways in which the parasite affects the host (11)
loss of blood or lymph mechanical obstruction of organs feed upon host tissues utilize host cells formation of tumors or nodules lesions irritation/worry transmission of other pathogens alteration in host digestion or nutritional intake subversion of immune system production of toxins
what are the 3 requirements of life
acquiring nutrition
protection from the environment
reproduction
