01:119:115 Lecture 28: Biology- Lecture 28 (Excretion - Chapter 44.1 & 44.4)

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:115
• Professor: Bendoud

Document Summary

Physiological systems of animals operate in a fluid environment. Extracellular fluid = outside cells interstitial fluid, lymph, blood plasma. Composition of fluids depends on balancing uptake & loss of h2o & solutes. Osmoregulation controls solute concentration + balances water gain and loss one of the functions of excretion: functions of the excretory systems, collect fluid from blood or interstitial tissue, osmoregulation: Regulation of water content humans die if lose > ~12% of body water. Regulation of concentration & distribution of ions cell processes fail if too dilute or too concentrated: excretion = removal of metabolic wastes from body different from non-metabolic wastes that are eliminated by large intestine i. ii. Co2 excreted by respiratory structures (lungs or gills) Based on balancing the uptake and loss of water and solutes: solutes and solutions, mole = molecular weight of a substance expressed in grams. H2o = (2 x 1) + (1 x 16) = 18 amu.