PHS 3341 Chapter Notes - Chapter 1: Hematopoietic Stem Cell Transplantation, Fluid Compartments, Somatic Cell Nuclear Transfer
Document Summary
Definition of homeostasis the ability of a cell or organism to regulate its internal conditions using feedback systems to minimize variation and maintain health regardless of changes in external environment. Usually we don"t have a specific set point but more of a range to follow. Definition of set point the desired level at which homeostatic control mechanisms maintain a controlled variable (non-steady) physiological state. Definition of physiological range normal range for a variable that is maintained over 85% of the time. Multicellular organisms" cells cant live without other cells because they do not have access to the external environment. Single-celled organism has access to its external environment to get nutrients and eliminate waste etc. Internal environment aqueous extracellular, has a plasma and interstitial fluid, allows multicellular organisms to make exchanges between its cells. Intracellular fluid (icf) within all body cells.
