Respiratory Flashcards
Respiration
breathing
External gas exchange
between the lungs and blood
Internal gas exchange
between systemic blood vessels and tissue
Intrapleural pressure
negative pressure, always lower than lungs to prevent collapse
Intrapulmonary pressure
pressure in alveoli
inspiration
gas flow into lungs
expiration
gas flow out of lungs
Boyles law
volume goes down, pressure goes up = air moves out
main site for gas exchange
Alveoli
Alveoli is surrounded by?
pulmonary capillaries
Type 1 Alveolar cells
simple squamous epithelium for diffusion
Type 2 Alveolar cells
produce surfactant for lubrication
macrophages job in alveolar
keep lungs clean
dalton’s law
partial pressure of each gas is proportional to its percentage
normal alveolar gas exchange
partial pressure of O2 and CO2 are equal between alveolus and pulmonary venous blood
Oxygenated Blood level
PO2= 104
PCO2= 40
Deoxygenated Blood level
PO2= 40
PCO2= 45
% of blood carried bound to hemoglobin
98.5%
arterial blood saturation
98%
venous blood saturation
75%
Borh Effect
increase in temp & CO2, deceases in Ph burn oxygen
% of CO2 dissolved in plasma
10%
% of CO2 bound to hemoglobin
20%
70% of CO2 is carried by
bicarbonate
