PHYSIOL 201 Chapter Notes - Chapter 19: Ph, Extracellular Fluid, Osmotic Concentration
3 Apr 2019
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Readings: chapter 14 pages 489 & table 14. 1. Homeostasis: the internal environment is maintained at a relatively constant composition, the internal environment is the extracellular fluid (ecf, the ecf (internal environment) is composed of. Interstitial fluid: plasma, specific variables within the internal environment are maintained at a relatively constant level. Kidneys: the kidneys are why we can eat what we want, drink what we want, vary our metabolic rate. Ecf osmolarity to maintain appropriate cell volumes and maintain ecf volume as a part of maintaining blood pressure: eliminate metabolic wastes and foreign substances, the kidneys do eliminate metabolic wastes and foreign substances. It is an important role, but is not regulated. If the waste or foreign substance is present in the filtrate it will be excreted. However, in situations of prolonged fasting or starvation, the kidneys can contribute a significant amount of glucose to the blood via gluconeogenesis: about 20% as much as the liver provides.
