Physiology 1021 Lecture Notes - Homeostasis, Membrane Potential, Osmotic Pressure

• School: Western University
• Department: Physiology
• Course: Physiology 1021
• Professor: John Ciriello

Document Summary

Section 1. 1 - intro to physiology: y cells need to be able to allow desired substances to pass in and waste to pass out while maintain internal environment. Physiology: study of function in living organisms, explores mechanisms by which the organisms control internal environment regardless of external environment. Internal environment: the fluid in which the cells of the body are bathed - consists of interstitial fluid and blood plasma. External environment: the region outside the body - includes space & contents of digestive, respiratory and urogenital tracts. -> air in our lungs and liquids in our urinary system are continuous to outside environment. Extracellular fluid and intracellular fluid: y extracellular outside our cells about 14k. Intracellular fluid - 67% of tbw (about 28l) - cells are living entities within our body. Interstitial fluid - 26. 4% of tbw (11l) - between the circulatory system and cells in our body. Extracellular fluid - 14l - fluid outside of the cell.