Physiology 2130 Lecture Notes - Human Musculoskeletal System, Urinary System, Blood Sugar
5 Feb 2013
School
Department
Course
Professor
Document Summary
What is physiology: the study of function in the living organism. Cells (in the stomach lining) tissues (layers of tissues in the stomach wall) organ (stomach) organ system (digestive system) . Organism (human: the cells in a multicellular organism must contribute to the homeostasis of the organism as a whole. Internal and external environments of the body: organ systems continuous with the external environment: Respiratory system (take air from the outside) Urinary system (excretes things our body doesn"t need) Digestive system: organ systems continuous with the internal environment: What is homeostasis: the ability of the body to maintain a relatively constant internal environment. Homeo = similar, stasis = condition: some fluctuations are normal: Normal blood glucose: 4 6 mmol/l before a meal. Negative feedback loops: a homeostatic feedback loop designed to keep your body at or near a set-point. Initial stimulus (house is too cold), response (furnace turns on), decreased stimulus (house warms up)
