Unit 4 General models in Physiology; Biology

Unit 4 General models in Physiology; Biology - Unit 4...

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Unit 4 General models in Physiology Unit 4.1 Homeostasis/Feedback – Control systems Chapter 49, pages 1039-1043 Learning Goals: Students will be able to build, test, and refine mental models of feedback systems that are used to regulate systems essential for life in multicellular organisms. Assessable Outcomes Students will be able to identify all the necessary components of a feedback system using appropriate vocabulary. Sensors : measures the conditions of the internal environment and relays to integrating center Integrating Center : contains set point for system, where sensors send information, often part of the brain or spinal cord, but can also be endocrine glands Effectors : muscles or glands that set the deviation back to normal (set point) Students will be able to generate feedback diagrams as they learn about new systems. Students will be able to use a feedback diagram to make predictions on how a system would react to perturbations of the system. Students will be able to explain the role of feedback in maintaining homeostasis. Feedback: compares with set point in the integrating center and can be changed depending on the situation Students will be able to define homeostasis and explain the difference between homeostasis and feedback. Homeostasis : when the cell works properly and the inside environment fluctuates constantly within narrow limits Feedback : when something happens outside of the narrow limits of homeostasis Students will be able to explain the need for and level of redundancy of systems Study Guide: Unit 4.2 Structure-function, Body and Cell organization Chap 42, pages 855-873 Learning Goals: The student should be able to: Argue the advantages and disadvantages of being a single cell vs. multicellular organism
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Appreciate the benefits of cellular specialization and the range of cellular variability Appraise the structure function relationship of multicellular vertebrate body organization Know the four major tissue types in the body, their defining characteristics and their major functional role Epithelial : covers all surfaces, provides a barrier that stops some things and lets others in, stops dehydration and air-borne pathogens for land-dwelling organisms, digestive tract must allow entry of digestive products but avoid pathogens and lungs must be able to diffuse gases rapidly Characteristics : cells are tightly bound together, amazing regenerative powers, two classes of membranes: simple and stratified Simple: one cell layer thick, lung and blood capillaries, rapid movement of molecules Squamous: flat , cuboidal: wide as they are tall , columnar : taller than wide Stratified : several cell layers thick, named for uppermost layers: epidermis Squamous : tough layer of cells; provides protection
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Unit 4 General models in Physiology; Biology - Unit 4...

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