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14 Cards in this Set
- Front
- Back
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anitbody
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y-shaped molecule with a binding site for specific anitgen, not effective against pathogens (virus)
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antigen
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surface markers on cell mebrane, foreign antigens cause immune response, reconzie 'self' from 'nonself'
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stimulus
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something that causes a reaction
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response
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reaction to a stimulus
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homeostasis
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keeping a stable internal condition as outside world changes, stimulus-response, return to set point
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positive feedback loop
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reaction resulting in increase of direction of change ex. puberty, childbirth
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negative feedback loop
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reaction resulting in reversal of direction of change, allows homeostasis to be maintained ex. heartbeat, thermoregulation, blood sugar
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afferent path
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carry toward
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efferent path
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carry outward
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control center
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evaluates info from receptor, compares to set point to determine appropiate action, decision passed on effernt pathway
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hypothalamus
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monitoring station, checks internal chemistry, directly connected to endocrine system
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pituitary gland
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directs many other glands, direct link to hypothalamus
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receptor (sensory organ)
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monitors internal condition and/or recognizes stimuli, info passed on afferent pathway to control
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effector (organ)
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responds to command of CC, reduce or enhance levels
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