Exam 3 Flashcards
Anatomical deadspace
Definition: A volume of air that is not involved in gas exchange and SHOULDN’T be.
Area you have to fill with air so you can get air to alveoli.
Tidal volume
Volume of air that’s getting involved in anatomical deadspace and alveolar ventilation.
Physiological deadspace
Never normal. The volume of air that is not involved in gas exchange but SHOULD be.
Hyperapnea
Increase in respiration because of an increase in oxygen. Ex: exercise
Hyperventilation
Increase in breathing WITHOUT an increase in oxygen demand.
Psychogenic. Brain does it to us. Voluntarily.
Hypoventilation
Decrease respiratory ventilation connected to CO2. Due to not breathing in much, you’re not breathing out much and CO2 levels will go up. No increase in oxygen.
Hypoventilation is causing high CO2.
Dyspnea
Trouble breathing and you are aware of it.
Ex: having an asthma attack
Orthopnea
Patient is having trouble breathing laying down but when sitting up, they breathe better due to having fluid in lungs.
Apnea
Temporary cessation (stopping) of breathing after a normal EXPIRATION.
Apneusis
Temporary cessation of breathing after a normal INSPIRATION.
Respiratory failure
Ceasing to breathe permanently.
What happens to PO2 if barometric pressure goes up?
PO2 increases
What happens to PO2 when barometric pressure goes down?
PO2 decreases.
What is the normal value of oxygen in an alveolus when you’re breathing normal room air?
100 mm of mercury
What is the normal alveolar CO2?
40 mm of mercury
