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24 Cards in this Set

  • Front
  • Back
blood flow thru muscle can increase ___X during exercise

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).
What is diffusion coeff of CO2 relative to O2?

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