L4 - pulmonary circ Flashcards
functions of pulmonary circ (PULMC)
gas exchange
-reservoirs for blood
filter
synthesis and metabolism
structure of pulm vessels
thin walled and highly branched than systematic vessels
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why is the pressure lower in PULMC than SYSTMC
the pulm vessels are wider and shorter so the blood move slower
- it has a lower resistance
does pulmc receives all of right ventricular output
yes
what features are low in pulmc
pressure due to thin wall and resistance due to short vessles and larger raduis
other features of pulmc
vessels can change shape easily
- have large SA capillary
- returns blood to left ventricle
whats the value of pulm ABP at the pulm artery value
28/8 mmHg
whats the pulm capillary pressure at pulmon artery level
8~10mmHg
difference in distance and its pressure between heart level to apex and base seperately
15cm and 12 mmHg for both distances
whats the pressure near base of the lungs when standing upright
28/8+12/12= 40/20 mmHg.
- the pressure becomes greater so the vessels becomes distended
whats the pressure near apex of the lungs when standing upright
28/8-12/12= 16/-4
- pressure not high enough so the vessels collapse
- no perfusion
when standing upright, what happends to pulm perfusion
increases from apex to base
when lying, what happens to pulm
perfusion is evely distributed from apex to base
what is capacitance of the pulm blood vol
when lying, there’s greater blood vol so higher capacitance
capacitiance functions
- standing upright increases return to left chambers
- CO and pulm ABP increases, perfusion increases
- increases blood vol
- if left ventr failure happens, filling towards the apex occurs