CHAPTER 49 Homeostasis

CHAPTER 49 Homeostasis - CHAPTER 49: HOMEOSTASIS THE NEED...

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CHAPTER 49: HOMEOSTASIS THE NEED TO MAINTAIN HOMEOSTASIS: Homeostasis: the dynamic constancy of the internal environment -most of the regulatory mechanisms of the vertebrae body that are not devoted to reproduction are concerned with maintaining homeostasis NEGATIVE FEEDBACK LOOPS: Sensors : measure each condition of the internal environment by constantly monitoring the extracellular conditions and relay this information to an Integrating center : contains the set point. Effectors: generally muscles or glands, and can change the value of the condition in question back toward the set point value -Summary of a negative feedback loop: Perturbing factor Stimulus Sensor Integrating center Effector Response -Examples of Negative feedback loops: 1. Regulating Body Temperature 2. Regulating Blood Glucose -monitored by the hormone insulin which is secreted in the Islets of Langerhans POSITIVE FEEDBACK LOOPS: -feedback loops that accentuate a disturbance, perturbations cause the effector to drive the value of the controlled variable even farther from the set point -Example of negative feedback loop; the contraction of the uterus OSMOLALITY AND OSMOTIC PRESSURE: Osmolality: the total moles of solute per kilogram of water
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CHAPTER 49 Homeostasis - CHAPTER 49: HOMEOSTASIS THE NEED...

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