lecture 3 - Lecture Professor Julian Schroeder I....

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1 Lecture Professor Julian Schroeder I. Components of Blood II. Gas Exchange III. Lungs IV. O 2 Transport V. CO 2 Transport I. COMPONENTS OF BLOOD A. VOLUME: 8% of adult body weight Centrifuged blood reveals plasma (clear) & cells (red) B. PLASMA 1) 90% Water 2) 3% electrolytes: NaCl, KCl, Ca2+, Mg2+, etc; Same as interstitial fluid; important for nerve function 3) 7% Proteins: Immunoglobulins (antibodies), Fibrinogens (clotting factors), Albumin (pH balance, osmotic balance)
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2 C. BLOOD CELLS RED BLOOD CELLS transport O 2 , CO 2 - 25x10 12 RBCs per 5L of blood WHITE BLOOD CELLS (leukocytes) fight infections, produce antibodies - 25x10 9 WBCs per 5L of blood THROMBUS: clot of platelets in blood artery I. COMPONENTS OF BLOOD Figure 42.15 I. COMPONENTS OF BLOOD D. CHOLESTEROL ATHEROSCLEROSIS: plaques of lipids on inner walls of arteries; causes hypertension= high blood pressure Figure 42.18
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3 I. COMPONENTS OF BLOOD ARTERIOSCLEROSIS: hardened plaques; reduced diameter; blood clot trapped more easily Cholesterol forms plaques LDL: Low Density Lipoproteins deposit cholesterol in plaques HDL: High Density Lipoproteins reduce deposition of cholesterol I. COMPONENTS OF BLOOD [LDL]/[HDL] = high high risk [LDL]/[HDL] = low low risk LDL to HDL Ratio: Levels of Risk
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4 O 2 uptake into blood / CO 2 release into atmosphere Atmosphere: 21% O 2 Water: variable O 2 content Multicellular animals take up O 2 by respiratory surfaces - One thin (squamous) cell layer - Moist epithelium solubilizes O 2 - Ventilation increases contact to air II. GAS EXCHANGE III. LUNGS A. Structure: branched lining within large surface area (human 200m²) - Air enters trachea (windpipe); mucus & cilia on epithelium move dust/contaminants out of lung - Bronchioles terminate in small air sacs: alveolus (~7x10 8 alveoli) Figure 42.23
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5 III. LUNGS B. Partial Pressure
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This note was uploaded on 04/19/2010 for the course BIOLOGY bild 2 taught by Professor Schroeder during the Spring '09 term at UCSD.

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lecture 3 - Lecture Professor Julian Schroeder I....

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