Respiration part 2 Flashcards
(29 cards)
Total Lung capacity
maximum amount of air the lungs can hold
Residual volume
amount of air left in the lungs after a maximal exhalation
what does residual volume allow
continuous gas exchange between alveoli and capillaries
vital capacity
the largest amount of air that can be exhaled following a maximal inhalation
forced vital capacity
based on amount of air and the speed it comes out
tidal volume
amount of air inhaled or exhaled per breath
minute ventilation
amount of air breathed in 1 min (L/min or ml/min)
Vi
inspired minute ventilation
Ve
expired minute ventilation
minute ventilaiton =
tidal volume (ml/breath) x frequency (breath/min)
typical minute ventilation values at rest
12-15 breaths per minute
400-600 ml per breath
alveolar ventilation
amount of air available for gas exchange
alveolar ventilation =
[tidal volume ml/breath - physiological dead space in ml/breath] x frequency in breaths/min
true or false: alveolar ventilation is less than minute ventilation
true because of residual physiological dead space
ambient air pressure
760mmHg
partial pressures
O2 = 20.93% PO2 159mmHg CO2 0.03% PCO2 0.2mmHg N2 = 79.04% PN2 600mmHg
Alveolar partial pressures
O2 14.5% PO2 103mmHg CO2 5.5% PCO2 39mmHg N2 80% PN2 571mmHg water vapour 47mmHg
arterial blood partial pressures at rest
PO2 100mmHg
PCO2 40mmHg
venous blood partial pressures at rest
PO2 40mmHg
PCO2 46mmHg
what is the main thing you need for gas exchange
pressure gradient
Cooperative binding
binding of O2 to hemoglobin
right shift of the oxyhemoglobin dissociation curve means?
more oxygen being picked up - like in exercise
what shape is the oxyhemoglobin dissociation curve?
sigmoidal
what partial pressure of oxygen does near complete O2 saturation occur?
60mmHg
