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physiology notes

lecture unit one - homeostasis physiological rhythms

QuestionAnswer
the study of function or how the body works physiology
levels of organization of the body elementary particles--atoms--molecules--organelles--cells--tissues--organs--organ systems--organism
maintenance of a stable steady internal environment of constancy of environment homeostasis
3 associated areas of physiology anatomy, physic, chemistry
___ regulate the activities of all body parts homeostatic processes
deviations from ___ ___ trigger reactions that work to counteract or reverse the change stable conditions
a principle which demonstrates the effects of various factors or conditions on functional efficiency of the bodily processes law of the maximum and minimum
pH, temperature, ion balance, sugar, are factors that applies to law of the maximum and minimum
optimal range or range of tolerance is known as law of the maximum and minimum
a control mechanism in which a response feeds back to the original point of stimulation basic feedback mechanism
3 basic components of basic feedback mechanism receptors, modulators, effectors
stimulus--_____----_____-----_____---response stimulus---receptor--modulator--effector-- response
specialized sensory cells/tissues receptors
what are called control points or control centers modulators
muscles and glands which may affect other tissues are called effectors
negative and positive feedback are types of feedback mechanisms
the response cancels or counteracts the original stimulus is known as negative feedback
body temperature control is an ex of a type of negative feedback
the response amplifies or enhances the original stimulus is known as positive feedback
labor contractions is an ex of positive feedback
2 sources of homeostatic control are intrinsic and extrinsic
control coming from within an organ/tissue via chemicals produced within the organ/tissue itself intrinsic
control comes from outside the organ extrinsic
regulation by nervouse system via neurotransmitters is a type of ___ homeostatic control that lasts in duration extrinsic and quicker and shorter in duration
regulation by endocrine system bia hormones is a type of ____ homeostatic control that lasts in duration extrinsic and slower and longer in duration
biorhythms that fluctuate or cycle every 24 hourse are referred toas circadian rhythms
homeostatic mechanisms allow bodily functions to fluctuate within narrow limits physiological rhythms
___ allow bodily functions to have a dynamic equilibrium physiological rhythms
fluctuations thend to follow wave patterns called biorhythms or physiological rhythms
most important tissue, the ____ may acts as a biological clock hypothalamus
jet lag, work rotation, radical sleep schedule are causes of desynchronosis
effects of ___ are decrease congitive function, general depression , off sleep cycle, decrease visual acuity desynchronosis
circadian rhythms are controlled internally by a ___ which can be set by various external stimuli most important being ___ biological clock and light
Created by: oolollipops on 2009-01-17



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