Bio 141| Lecture 1 | Homeostasis | (1/11/16)
Bio 141| Lecture 1 | Homeostasis | (1/11/16) Bio 141
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This 1 page Class Notes was uploaded by Gabriella Morales on Thursday January 21, 2016. The Class Notes belongs to Bio 141 at Pennsylvania State University taught by Dr. Jenelle Malcos in Winter 2016. Since its upload, it has received 35 views. For similar materials see Biology and Physiology in Biology at Pennsylvania State University.
Reviews for Bio 141| Lecture 1 | Homeostasis | (1/11/16)
Killer notes! I'm stoked I can finally just pay attention in class!!!
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Date Created: 01/21/16
Homeostasis 1/11/16 9:04 AM Homeostasis: Body's ability to maintain a constant environment Same status for different conditions Large external change/ small internal change Example of large change: Change of temp/ fluctuation of nutrients in animals Example of small change: How much oxygen we're using, sugar, pH balance Body has set points How does this work? Negative/Positive Feedback Loops Loop= Ability of the body to monitor something, make a change, and come back to homeostasis Completed with different molecules, cells, and tissues Negative Feedback Loop: Pushes us AWAY from homeostasis Simple Example: 1. Room drops below 72 degrees set point ( May be caused by an external force such as winter) 2. Thermostat senses change and turns on furnace 3. Response being the furnace to raise temperature back to set point 4. Thermostat sense change and the furnace is turned off Physiological Example: 1. Temperature is 37 deg. C 2. Receptors in brain sense change (Thalmus) 3. Brain integrates info and decides how to respond 4. A system responds and negates the factor 5. Homeostasis is restored Positive Feedback Loop Starts with a small change, and the small change becomes bigger and bigger Positive movement, the change is supported Causes a rapid change in the body Ex: A baby's head pushing onto the cervix and crowning prior to the delivery (good thing to happen in order for baby to be delivered properly)
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