Lecture19_084115

Lecture19_084115 - HumanPhysiology Biol1020 n...

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Human Physiology:  Biol 1020 n Instructor : Katie Grinnell Contact info: [email protected] n [email protected] n Location and time : Liston campus, 7:00-9:25  pm on Thursdays n Class website : TBA n WebCT site—visit Cindy Hansen’s site for 
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Click to edit Master subtitle style Chapter 1:  Introduction and  September 9, 2010
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Biology n The science of life and of living  organisms, including their structure,  function, growth, origin, evolution, and  distribution. 
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Anatomy n The science of the shape and  structure of organisms and their parts.
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What is Physiology? n Physis  = nature;  logos  = study n The study of  biological function How the body works  All the way from cellular level to the entire  organism Based on “cause-and-effect” n Pathophysiology and comparative 
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Branches of Physiology n “Non-human” physiology n Human physiology Systemic physiology n Relating to or affecting a particular body  system Special physiology n Physiology of specific organs 
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Homeostasis n Always want to maintain a constant  internal environment n Physiologist Walter Cannon n Homeostasis  = internal constancy n Physiological functions are all aimed at  maintaining homeostasis
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How do we stay “in  homeostasis”?? n How do we know if we AREN’T in  homeostasis? n We need to have sensors that are able  to detect if we are moving away from  our  “set point” n What is a set point?? It’s just like the temperature to which you 
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Feedback Loops n The body has set points for body  temperature, blood glucose concentration,  tension on a tendon, etc. n When a sensor detects a deviation from its  set point, it must relay this info to an  “integrating center” It receives info from many sensors It’s usually a particular region of the brain or spinal 
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Feedback Loops n The job of the integrating center is to  receive different sensory inputs and  then respond by either increasing or  decreasing the activity of various  effectors Effectors are usually muscles or glands
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Thermostat analogy n You set your house’s  thermostat to a set point of  70°C n If the temperature in the  house drops sufficiently  below the set point, a sensor  within the thermostat will  detect this n This activates the  thermostat’s integrating  center, which in turn  activates an effector
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Negative Feedback Loop  Examples n Body temperature exceeds the set point of  37°C Sensors in brain detects deviation and sends  signal to integrating center in brain The integrating center then stimulates the  activities of effectors, including sweat glands,  which then lower body temp n Blood glucose levels fall below the set point
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This note was uploaded on 04/12/2011 for the course BIOL 1020 taught by Professor Staff during the Spring '11 term at North Texas.

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Lecture19_084115 - HumanPhysiology Biol1020 n...

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