AP 151 Introduction to  Human Physiology

AP 151 Introduction to Human Physiology PowerPoint PPT Presentation


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1-2. Physiology. Considers the operation of specific organ systemsRenal ? kidney functionNeurophysiology ? workings of the nervous systemCardiovascular ? operation of the heart and blood vesselsFocuses on the functions of the body, often at the cellular or molecular levelUnderstanding physiolo

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AP 151 Introduction to Human Physiology

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1. 1-1 AP 151 Introduction to Human Physiology Chapter 1 HOMEOSTASIS

2. 1-2 Physiology Considers the operation of specific organ systems Renal – kidney function Neurophysiology – workings of the nervous system Cardiovascular – operation of the heart and blood vessels Focuses on the functions of the body, often at the cellular or molecular level Understanding physiology also requires a knowledge of physics, which explains electrical currents, blood pressure, and the way air pressure allows the movement of air into and out of the lungs

3. 1-3 Approaches to Physiology Mechanistic approach - asks “how” a function occurs How do red blood cells carry oxygen? Teleological approach - asks “why” a function occurs Why do red blood cells carry oxygen?

4. 1-4 Body Environments and Fluids External environment The air in which we live Body fluids - two major compartments Intracellular fluid - cytosol; fluid within cells (28 L=67%) Extracellular fluid - all fluid outside cells of the body Plasma - liquid component of blood (3L=7%) Interstitial fluid - aka, tissue fluid; fluid bathing cells (11L=26%) Claude Bernard called this the “milieu interieux”; the internal environment. There is a constant interaction between these 3 fluids They are separated form one another only by cell membranes Therefore, changing one (especially tissue fluid) has effects on the other two

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