Respiration 4 Flashcards
ventilation
air getting to alveoli
perfusion
air getting to the tissue
Is blood pressure or ventilation higher at the base of the lung?
blood pressure
At the apex of the lung is blood pressure or ventilation higher?
ventilation
at what point in teh lung does ventilation and perfusion natulary reach equiliburm
rib 3
what declines faster blood flow or venaltion
blood flow
what percent of the lung preforms the correct ventilation to profusion ratio without other help
about 75%
what mechanism happens if blood flow is better than ventalation
decreaesd blood flow to that area an will move to an area with less blood flow
what happens if ventaltion is greater than bloodflow
increaseed blood flow to area due to vasco dilation
shunt
passage of blood through an area of lung that is poorly ventalated
areloare dead space
an alveoi that is ventalated but not perfused with blood
physilog dead space
aveloiar dead space + anatomical dead space
what happesn do heart reate during inspiration
increases
what happens to heart rate during expiration
decreased
why does heart rate change during breathing
otherwise alveolar deadspace would increase during inspiration and shunt would increase during exspiration, so maintains constant perfusion
how much 02 is dissolved in plasma per liter
3ml
how much 02 is disleved into haemoglovib per liter
197ml