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Unit 3 Unit title : HOMEOSTASIS

Unit 3 Unit title : HOMEOSTASIS. Area of interaction : Health and social education. MYP unit question: What advantage or disadvantage is it to be warm blooded?. Summative assestment : Exposition about the role of homeostatic processes for the maintenance of life. Summative Assessment.

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Unit 3 Unit title : HOMEOSTASIS

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  1. Unit 3Unittitle: HOMEOSTASIS Area of interaction: Health and social education MYP unit question: What advantage or disadvantage is it to be warm blooded? Summativeassestment: Exposition about the role of homeostatic processes for the maintenance of life.

  2. SummativeAssessment • Youwillmake a presentation of 5-8 minutes. Itwill be presented in classthe 16th of april. • Youshouldalsowritedown a summary of 2-3 pages (withreferences in APA format) and presentitthe 11th of april (itshould be sendto me byphidias). I willcorrectthem and sendthemtothewholeclass. • Itmustbe a creativepresentation of information. • Subjects: • role of the hypothalamus to control body temperature • role of sweatglandsto control body temperature • role of the skinarteriolesto control body temperature • role of shivering to control body temperature • Include one advantage and one disadvantage of being warm blooded • Criteria Evaluated: B and C

  3. Homeostasis • A state of balance in the body

  4. What is Homeostasis? “The maintenance of a constant environment in the body”. • Your body has many mechanisms that keep the cells surroundings constant even though your external environment is changing. This is homeostasis.

  5. Body cells work best if they have the correct... • Body temperature • Blood pH • Carbon dioxide concentration • Blood glucose concentration • Water balance http://biocalaix.wordpress.com/2011/05/22/imatges-de-cel-lules-sanguinies/red-blood-cells-sem/

  6. The endocrine system is involved directly in homeostatic processes… Both, the endocrine system and nervous system are involved in controlling the internal environment of our bodies. The endocrine system consists of glands, which release hormones that are transported in the blood. http://www.web-books.com/eLibrary/Medicine/Physiology/Endocrine/Endocrine.htm http://www.faqs.org/health/Body-by-Design-V2/The-Nervous-System-Design-parts-of-the-nervous-system.html

  7. Negative feedback http://www.phys.unsw.edu.au/biosnippets/ • Occurs when feedback (from sensor to integrator) results in a reversal of the direction of change. • An example: thermostat's response causes temperature decrease to reverse and become a temperature increase. • Negative feedback tends to stabilize a system.

  8. Hire-wire Artist Model • Variable:position of body • Setpoint:directly over the wire • Sensors:nerve receptors (eyes, inner ears, muscle stretch receptors, etc.) • Integrator:brain • Effectors:skeletal muscles http://www.popcrunch.com/16-entertainers-who-died-in-the-act/philippe-petit/ High-wire artist uses negative feedback to maintain relatively constant position on wire.

  9. Controlling Glucose levels • Your cells also need an exact level of glucose in the blood. • Excess glucose gets turned into glycogen in the liver • This is regulated by 2 hormones (chemicals) from the pancreas called: Insulin Glucagon http://www.medicinayprevencion.com/pancreas.htm

  10. Ypuneedtosearch Diabetes in thelistontheleftupperside, in ordertoseetheanimations http://www.medmovie.com/mmdatabase/mediaplayer.aspx

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