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Ingestion - Slide 1 Ingestive behaviors Slide 2...

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Slide 1 Ingestive behaviors ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 2 Physiological regulatory mechanisms • Homeostasis Mammals maintain homeostatic balance through several regulatory mechanisms ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 3 Regulatory mechanisms Each mechanism controlling homeostasis consists of: System variable Set point Detector Correctional mechanism Negative feedback ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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Slide 4 Negative feedback Negative feedback is critical ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 5 Ingestive behaviors Eating and drinking are correctional mechanisms Satiety signals are used by animals to terminate ingestive behaviors ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 6 Fluid balance in the body Fluid is contained in 4 compartments: – Intracellular compartment – Extracellular compartments Intravascular fluid Interstitial fluid Cerebrospinal fluid ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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Slide 7 Intracellular fluid balance Intracellular fluid concentration is controlled by the concentration of solutes in the surrounding interstitial fluid – Isotonic – Hypertonic – Hypotonic ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 8 Intravascular fluid balance Intravascular fluid makes up blood volume – Hypovolemia Intracellular fluid concentrations (cell volume) and intravascular fluid levels (blood volume) are monitored by receptors that signal two different types of thirst ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 9 Osmometric thirst Loss of water from the intracellular compartment ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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Slide 10 Osmometric thirst Cellular volume is monitored by osmoreceptors Firing of osmoreceptors signals osmometric thirst ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 11 Regulating fluid levels ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 12 Volumetric thirst Results when intravascular fluid volume is decreased ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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Slide 13 Volumetric thirst Blood volume is monitored by two sets of receptors – Receptors in the kidneys detect decreased blood flow Renin
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