01:119:116 Lecture Notes - Lecture 27: Blood Vessel, Partial Pressure, Trachea

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:116
• Professor: All

Document Summary

27: respiration: organismic respiration: gas exchange between organism and environment, partial pressure: pressure exerted by a specific gas in a mixture of gases. To calculate: need to know p of mixture, fraction of specific gas in mixture. Diffusion of gas - higher partial p lower partial p: gas exchange in small aquatic organisms. <1 mm thick (almost every cell in contact with environment) Respiratory structures: adapted for gas exchange via air or water; thin walls, large surface area, moist, many blood vessels. Small organisms high surface area to volume ratio. Low metabolic rate don"t need much oxygen. Must be moist (even when organism is terrestrial) Most common respiration in multicellular aquatic animals. Folded exchange surfaces extend from body, increase sa. Ventilation: mechanism to move air over respiratory surface. For fish: if h2o is still depleted o2 (why fish swim constantly) For bony fish: have operculum - external bony plate over gills.