What is the main difference between the pulmonary and systemic circulations with respect to their autoregulatory response to changes in blood O2 level?
What will be an ideal response
In systemic circulation, low O2 causes dilation of the blood vessel walls. This will lead to increase in O2 delivery to tissues. In pulmonary circulation, the opposite occurs in response to low levels of O2. The pulmonary vessels constrict to ensure blood only goes to those alveoli that are receiving rich O2 supply and avoids poorly ventilated sacs.
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