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 blood pressure and respiration  

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Is blood pressure increased during inspiration or decreased and why? Because I found opposite opinions about that issue.


inspiration : intrapleural pressure decreases (more -ve) distends veins a/a rt.atrium therefore inc. venous return and consequently inc. cardiac output(rt. sided) however because of tht same -ve intrapleural pressure capillaries in the lungs open up thus accomodating a significant proportion of rt.sided cardiac ouput and holding back a proprotion of venous return to left atrium ther fore left sided CO decreases and via baroreceptor mechanisms a/a strecth of rt.atria heart rate increases!

try out the sequence of expiration urself; final conclusion wud be:

expiration- BP goes up (atleast initially during expiration) and HR goes down!

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