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