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To maintain stable internal conditions regardless of what's changing outside the body. |
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all homeostatic control mechanisms involving at least 3 components that work together: receptors, control center and effectors |
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a sensor that monitors the environment and responds to changes (stimuli) and sends info to the control center |
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determines the "set point" at which a variable is maintained. Analyzes input and determines the correct response |
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gives the output response |
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output shuts off the original effect or reduces it. The variable then goes in the opposite direction it was originally to return it to its "ideal" value |
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response enhances the original stimulus so the response goes faster. The result processes in the same direction as the initial change . |
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what is the front of the lower leg called? |
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what is the back of the lower leg called? |
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what are the sides of the lower leg called? |
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what is the top of the foot called |
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what is the bottom of the foot called |
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what are the functions of epithelial tissue |
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Definition
protection, absorption, filtration excretion, secretion and sensory reception |
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describe the apical surface |
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Definition
upper free surface, exposed to the body exterior, has micro villi that increases the surface area |
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describe the basal surface |
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adhesive sheet containing glycoproteins, acts as a filter that determines which molecules are allowed in the epithelium |
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bind adjacent cells to epithelium, helps to keep proteins in the apical region from diffusing into the basal region |
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reinforces the epithelial sheet, helps resist stretching and tearing and defines the epithelial boundary |
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where are simple squamous cells |
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kidneys, air sacs in lungs, lining of the heart & blood vessels, lymphatic vessels |
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what is the function of simple squamous cells |
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allows materials to pass by diffusion and filtration, and secretes lubrication |
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where are simple cuboidal cells |
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kidney tubules, small glands and ovary surface |
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what is the function of simple cuboidal cell |
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where are simple columnar cells |
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digestive tract, gallbladder, small bronchi and uterine tubes |
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what is the function of simple columnar cells |
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absorption and secretion of mucus and ciliated cells propel the mucus |
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where are pseudostratified columnar cells |
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trachea, and most of the upper respiratory tract |
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what is the function of pseudostratified columnar cells |
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secretes but does not absorb mucus, and propels that mucus by cilia |
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where is stratified squamous cells |
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non-keratinized areas: esophagus, mouth and vagina |
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what is the function of stratified squamous cells |
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protects underlying tissues in areas subjected to abraison |
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where are transitional cells |
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what is the function of transitional cells |
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to stretch when there is urine in the specific area |
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