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Physiology Lecture 1.docx

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Physiology 2130
Anita Woods

Physiology Lecture 1 – Homeostasis  What is Physiology? o The study of FUNCTION in the living organism  Example: Stomach  Cells (in the stomach lining)  Tissues (layers of tissues in the stomach wall)  Organ (stomach)  Organ System (digestive system)  Organism (human) o The cells in a multicellular organism must contribute to the Homeostasis of the organism as a whole  Internal and External Environments of the Body o Organ systems continuous with the external environment:  Respiratory system (take air from the outside)  Urinary system (excretes things our body doesn’t need)  Reproductive system  Digestive system o Organ systems continuous with the internal environment:  Musculoskeletal system  Circulatory system  What is Homeostasis? o The ability of the body to maintain a relatively constant internal environment  Homeo = similar, Stasis = condition o Some fluctuations are normal:  Normal blood pH: 7.38 – 7.42  Normal blood glucose: 4 – 6 mmol/L before a meal  Negative Feedback Loops o A homeostatic feedback loop designed to keep your body at or near a set-point  Example: Furnace  Temperature in house goes down, furnace turns on, heats up the house until the set-point and then stops o A change in a controlled variable (example: body temperature) triggers a response that drives the variable in the OPPOSITE direction  Initia
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