BIOL 171 Lecture Notes - Oliguria, Angiotensin-Converting Enzyme, Blood Pressure
Document Summary
Homeostasis: the ability of the body to maintain a relatively constant internal environment. Homeostasis of cells depends on homeostasis of body fluids and electrolytes (if cells are not homeostatic, the rest of the body can"t be either) Body fluid: all water and dissolved substances in the body"s fluid compartments. Mechanisms regulate: total volume distribution concentration of solutes ph. Water: fluids account for 60% of adult total body weight about 75% at birth may drop to 45% in elderly. Intracellular fluid: inside the 50 trillion cells in body cytoplasm. Extracellular fluid: fluid filling in extra/empty space around body. Trans-cellular fluid: in specialized places (eyeballs, joints, serous fluids) Blood: lots of sodium lots of chloride little potassium lots of protein* lots of hco3- (bicarbonate ions) Cells: not much sodium (constantly trying to pump it out) not much chloride tons of potassium (constantly trying to gather more) lots of protein* lots of hpo42.
