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HOMEOSTASIS (Homeostasis (Cells in multicellular organisms (Can't…
HOMEOSTASIS
Homeostasis
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Temp, volume and composition regulated
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Imbalance
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If negative feedback mechanisms become overwhelmed, destructive positive feedback mechanisms may take over
Malfunctions of body systems result in homeostatic imbalance - unstable internal environment, cell function disrupted leads to pathology
Ageing - control system less efficient, internal environment less stable, increased risk of illness
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Terms
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Negative feedback - regulated variable decreases, system responds to make it increase and is self correcting
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Forward feedback - response reinforces stimulus, sending variables farther from set point
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Components
Receptors - sensors that detect stimuli (thermo, chemo, baro)
Integrating center - orchestrates appropriate response, many found in brain
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External environment
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Air in lungs, urine in bladder
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Control systems
Intrinsic regulation
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Cell, tissue, organ or organ system adjusts its activities automatically in response to environmental change
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