01:119:116 Lecture Notes - Lecture 27: Countercurrent Exchange, Gas Exchange, Cellular Respiration
15 Mar 2016
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P exerted by a particular gas in a mixture of gases. Calculate partial p: p that gas mixture exerts, fraction of mixture represented by particular gas, ex: o2 at sea level. Po2 = 0. 21 x 760 = 160 mmhg. Characteristics: gas exchange, air or water, features. Types: body surface, gills, tracheal tubes, lungs (cid:1) Characteristics: simplest type, entire body surface, small organisms. Higher surface area to volume ratio: low metabolic rate, terrestrial moist env, may also have gills or lungs. Examples: most annelids, some mollusks and amphibians, not found in larger, active organisms (cid:1, gills. Intro: most common in multicellular aquatic animals, gas exchange in h2o, evaginated exchange surfaces. Inner surface contact without circulatory system: increase surface area maximize o2 intake and co2 release. Structure of gills bony fish: gills along edges of gill slits, filaments 2 rows in each gil, afferent artery blood into filament, efferent artery blood out of filament, capillary beds.
