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### 24 Cards in this Set

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 blood flow thru muscle can increase ___X during exercise 20x 50 to 80 ml.min/100g of muscle resting blood flow in muscle 3-4 ml/min/100gm muscle in muscle, most blood flow occurs when? b/w contractions thebesian veins? The thebesian veins are small venous tributaries that drain directly into the cardiac chambers. Coronary blood flow is 225 ml/ min on the average which is _____% of the C.O. 4 to 5 Controllers of oxygen to the heart 1. Response to nutritional need 2. Oxygen demand is a major factor 3. Adenosine is the most likely vasodilator although H+, carbon dioxide, bradykinin, prostaglandins, and adenosine phosphate metabolites are the other possibilities. Cardiac muscle uses mainly _____ for energy fatty acids Henry's law of partial pressure the partial pressure = conc of dissolved gas / solubility coeff What is the solubility coeffs of O2 and CO2 O2: 0.024 CO2: 0.57 Water exerts vapor pressure- __ mmHg at body temperature (37oC). 47 What is diffusion coeff of CO2 relative to O2? CO? CO2 = 20.3 CO = 0.81 What are the partial pressures of gases in alveolar air? N2= 569 mmHg (74.9%) O2= 104 mmHg (13.6%) CO2= 40 mmHg (5.3%) H20= 47 mmHg (6.2%) What are the partial pressures of gases in humidified air? N2= 563 mmHg (74.1%) O2= 149 mmHg (19.7%) CO2= 0.3 mmHg (0.04%) H20= 47 mmHg (6.2%) What are the partial pressures of gases in expired air? N2= 566 mmHg (74.5%) O2= 120 mmHg (15.7%) CO2= 27 mmHg (3.6%) H20= 47 mmHg (6.2%) what is effect of humidification on the partial pressures? decreases them What is the respiratory unit? respiratory bronchiole, alveolar ducts, atria, and alveoli B. The respiratory membrane has 6 different layers. What are they? 1. A layer of fluid lining the alveolus and containing surfactant 2. The alveolar epithelium 3. An epithelial basement membrane 4. A thin interstitial space between the alveolar epithelium and the capillary membrane 5. A capillary basement membrane that in many places fuses with the alveolar epithelial basement membrane 6. The capillary endothelial membrane What factors affect the rate of diffusion across the membrane? 1. Thickness 2. Surface area 3. Diffusion coefficient 4. Partial pressure difference diffusing capacity for oxygen under resting conditions averages ______ 21 ml/min/mm Hg average diffusing capacity for carbon monoxide in young men at rest is ______ 17 ml/min/mm Hg, diffusing capacity for carbon dioxide under resting conditions of about ______ 400 to 450 ml/min/mm Hg diffusing capacity for oxygen increases in young men to a maximum of about ______ during exercise 65 ml/min/mm Hg, which is three times the diffusing capacity under resting conditions what can be used to measure diffusing capacity? Carbon monoxide There is more to this lecture, so why are there not more questions? Too sleepy