Lecture 18 respiratory System Mar 10

Lecture 18 respiratory System Mar 10 - BISC 220 General...

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BISC 220 General Biology Cell Biology and Physiology Instructor for Part 2 Michael Jakowec, PhD mjakowec@surgery.usc.edu Lab: MCA-241 (HSC Campus) Office Hours: ? Q & A: Hedco 100 Thursday 2 to 3 pm
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Date Day Lecture No. Topic Mar 3 Thurs 16 Cardiovascular System 1: Heart Mar 8 Tues 17 Cardiovascular System 2: Blood System Mar 10 Thurs 18 Respiratory System Mar 11 Friday Exam Lectures 9 to 16 Mar 15 and 17 Optional Spring Break (Studying of course) Mar 22 Tues 19 Immunity 1 Mar 24 Thurs 20 Immunity 2 Mar 29 Tues 21 Fluid and electrolytic balance 1 Mar 31 Thurs 22 Fluid and electrolytic balance 2 Apr 5 Tues 23 Endocrine System 1 Apr 7 Thurs 24 Endocrine System 2 Apr 8 Friday Exam Lectures 17-23 Apr 12 Tues 25 Reproduction 1 Apr14 Thurs 26 Reproduction 2 Apr 19 Tues 27 Nervous System 1 Apr 21 Thurs 28 Nervous System 2 Apr 26 Tues 29 Motor System 1 Apr 28 Thurs 30 Motor System 2 May 10 Exam Lectures 24 -30
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Lecture 18 Thursday March 10 Respiratory System Sections 42.5 to 42.7
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Cinematic Study Guide
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Movement of Gases Gas exchange = uptake of O2 and discharge of CO2 Partial pressure is the driving force for gas exchange
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Partial Pressure of O2 At 760 mm Hg (sea level) PO2 of oxygen (21% of composition of air) equals 760 x 0.21 = 160 mm Hg
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Oxygen content of water Amount of gas in water is proportional to Partial Pressure of gas above and its solubility (salinity and temperature). Even though PO2 is 160 mm Hg there is much less O2 in water due to its low solubility (4 to 8 ml of O2 per L water or 0.4 to 0.8%)
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Life has evolved methods to exchange gases in water
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Fig. 42-21 arapodium (functions as gill) a) Marine worm Gills (b) Crayfish (c) Sea star Tube foot Coelom Gills Water serves as a source of Oxygen Gas exchange in water is very demanding
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Respiratory surfaces are moist Plasma membrane is in contact with aqueous solution. Gas exchange is fast when area for
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This note was uploaded on 02/28/2012 for the course BIO 220 taught by Professor Morre during the Spring '09 term at USC.

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Lecture 18 respiratory System Mar 10 - BISC 220 General...

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