NUTR 125 Lecture Notes - Lecture 18: List Of Lakes By Volume, Antidiuretic, Aldosterone
Document Summary
Muscles contain 73% water (fat contains ~20%) Water shifts freely in and out of cells. Intracellular water volume depends on intracellular potassium and phosphate. Extracellular water volume depends on extracellular sodium and chloride. Potassium, phosphate, sodium and chloride are examples of minerals concentrations concentrations. Body secretes fluid via perspiration; skin is cooled as perspiration evaporates. Thirst signal is not triggered until person loses 1%-2% of body weight in fluid. Athletes need to monitor their fluid status, weigh themselves before and after training. Goal is to consume 3 cups for every pound lost. Illness (vomiting, diarrhea, fever) can occur with dehydration. Antidiuretic hormone: forces the kidney to conserve water (reduces urine flow) Aldosterone: signals the kidney to retain sodium (and thus, water) May serve as structural components of enzymes ( cofactors ) Some minerals are essential for metabolic function. Essential minerals classified as major or trace . Not all ingested minerals can be absorbed well.
