respiratory Flashcards
function of respiratory system
Humidifies air: prevents damage to membranes due to drying out
Warms air: helps maintain body temp of lungs
Filters air: mucus traps particles, cilia move mucus towards oral cavity to be expelled (coughed out)
pleural sac
double layered membrane that encases each lung
intrapleural pressure
pressure in the pleural cavity between visceral and parietal pleura
visceral pleura
parietal pleura
visceral: outer surface of lungs
parietal: inner surface of thoracic cavity and diaphragm
airflow resistance
pressure gradient will move from areas of high to low concentration. The pressure difference between one area and another reflect airflow resistance
p1-p2/resistance
main factor effecting airflow
diameter
pulmonary ventilation
amount of air moved in and out of lungs per unit of time (measured in minutes)
Vol of air moved per minute is calculated as what?
VE = VT x f
VE=?
pulm ventilation
VT=?
tidal volume or air moved per breath
f=?
breathing frequency per minute
Oxyhemoglobin dissociation curve shifts to the right when….
hemoglobin becomes less likely to bind to O2 and more likely to unload into cells of the tissue
Oxyhemoglobin dissociation curve shifts to the left when….
hemoglobin is MORE likely to bind
Inspiratory reserve volume (IRV) = ?
amount of air above tidal volume during forced inhale
Expiratory reserve volume (ERV) = ?
maximum amount of air expelled after a maximum inhalation
