Values Flashcards
barometric pressure at sea level
760 mmHg
respiratory phys, what does 760 mmHg equate to?
0 cm H2O
what’s intrapleural pressure at rest? during inhalation? exhalation?
-5cm H20, -8cm H2O, -1cm H2O (can go positive with additional effort)
VT
about 500mL
Valv
VT - patient’s weight/volume of conducting airways
pulmonary blood pressure
about 25/15
mucus components
97% water, 3% solids (antimicrobial molecules, immune cells, protective molecules like trefoil and heregulin)
avg alveolar ventilation
about 4L/min
avg blood flow
about 5mL/min
O2 and CO2 exchange per minute (these are not traded, diffusion occurs independently)
O2 = 250mL CO2 = 200mL
Type 1 alveolar cell population
40% of cell population, 90% of alveolar surface
Type 2 alveolar cells population
60% of cell population, 10% of alveolar surface
these are the guys that make surfactant!
What are the stages of respiratory development in weeks?
embryonic (4-7) psuedo-glandular (8-16) canalicular (17-26), surfactant kicks in 23-25 weeks terminal sac (26-birth) postnatal (post-birth)
normal O2:CO2 ratio, with glucose IV, strictly fats
8: 10 or 0.8
1: 1 or 1.0
7: 10 or 0.7
how much more soluble is CO2 than O2 in the blood?
20x more soluble
about 2.7 mL C02/dL blood/100 mmHg
primary transportation method of CO2
bicarbonate via carbonic anhydrase, about 86% of total CO2
PI O2 normal
149.3
Pa O2 normal
80-100, use 90 for equations
Pa CO2 normal
35 - 45 mmHg, use 40 for equations
Arterial pH (pHa)
7.35 - 7.45, use 7.4 for equations
HCO3 normal
22 - 26, use 24 for equations
V/Q normal
4L/min / 5L/min, 0.8
high V/Q and low V/Q are clinical terms used.. numerator is air flow and denominator is blood flow
partial pressure of oxygen in normal room air
0.21 or 21%
