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Sainila Atiifale

CH 2

homeostasis relatively constant states maintained by the body
integeumentary separates internal from external environment
skeletal stores minerals that can be moved into and out of internal fluid
muscular provides heat
nervous sensing changes, integrates info, and send signal to effector
endocrine secrets signaling hormones that travel through internal environments to effector cells
lymphatic draining excess fluid from tissues clean and recycle bloodstream
cardiovascular Transport nutrients, oxygen, water, wastes, within internal environment
immune defends internal environment
respiratory exchange of o2 and co2 levels in body
digestive absorbing nutrients into internal environment
urinary maintains and regulates ph levels, internal water volume, and ions and other substances
reproductive code containing info for offspring and homeostasis as well
feedback control loops info and feedback from hormones secreted in blood
basic components of control systems sensor mechanism integrator or control center effector mechanism feedback
afferent signal traveling toward particular center
efferent moving away from center
variable any state or condition in the body that can change
sensor identify condition being controlled
integrator receives input from sensor
effectors organs that directly influence controlled physiological variables
hypothamalus "thermostat" of the body that receives info in the brain
negative feedback oppose or negate a change
stimulus change in variable that elicits a reaction in feedback loop
response the reaction of effector in feedback loop
positive feedback amplify or reinforce change thats occuring
oxytocin (OT) pituitary gland secreted hormone
circadian rythm daily rhythms or cycles
feed-forward info is integrated, causing a trigger change, in anticipation of an event that will follow
intracellular control mechanisms operate at cell level
intrinsic control operate at tissue and organ level
extrinsic control "outside" control and operates at system and organism levels
Created by: Sainila.atiifale
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