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Homeostasis in Blood Pressure Using Feedback Loops

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by

Annarose Leff

on 11 December 2012

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Transcript of Homeostasis in Blood Pressure Using Feedback Loops

Homeostasis in Blood Pressure Using Feedback Loops What is Blood Pressure? Blood Pressure is the strength of the blood pushing against the blood vessels. All animals, except for some invertebrates (such as flatworms) have blood and must maintain homeostasis with their blood pressure. Blood pressure can change depending on their environment or their actions. If an animal is exercising and their heart is beating quickly, then their blood pressure will go up and they would need to relax their blood vessels a little bit to make the canals larger and the pressure smaller. Negative Feedback Loop The heart, the blood vessels, and the brain stem are the parts of the animal involved in keeping homeostasis in blood pressure. The Feedback Loop Stimulus A person stands up from laying
down and gravity keeps the blood
low. Receptor The heart, aorta (artery leaving the heart), internal carotid artery (artery taking blood to the brain) have sensors which detect changes in blood pressure. Integrating Center The brain stem (the bottom part of the brain that controls body functions like breathing and heart beat) gets the information that the blood pressure is too high. Effector The heart slows down and the blood vessels relax to let more blood through, this lowers the blood pressure. Response The blood pressure adjusts and
is normalized. If the feedback loop failed, the blood pressure would not be adjusted and the animal would be at risk for a heart attack, stroke, or kidney failure. Sources http://www.pc.maricopa.edu/Biology/pfinkenstadt/BIO201/201LessonBuilder/UnitOne/Homeostasis/index.html http://highered.mcgraw-hill.com/sites/dl/free/0073403490/578766/sample_chapter01.pdf http://your-blood-pressure.blogspot.com/2005/12/why-is-blood-pressure-important.html http://www.nursingtimes.net/nursing-practice/clinical-zones/respiratory/homeostasis-part-1-anatomy-and-physiology/203292.article
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