This simulator demonstrates how falling alveolar oxygen tension triggers closure of oxygen-sensitive potassium channels in pulmonary arteriole smooth muscle, driving calcium influx and vessel constriction, and how the scale of hypoxia, from a single alveolus to the entire lung, determines whether the reflex beneficially redirects blood flow or dangerously raises pulmonary artery pressure and right heart workload.
Adjust the oxygen level in one or more alveolar regions and observe the corresponding pulmonary arteriole respond in real time, tracking potassium channel state, membrane potential, intracellular calcium, and vessel diameter. Expand the hypoxic region from a small localized patch to the entire lung to see how blood flow redistribution and overall pulmonary artery pressure change as the reflex shifts from a protective, local adjustment to a widespread, pressure-raising response.
Sliders control alveolar oxygen tension for one or more lung regions and the spatial extent of hypoxia (localized patch versus whole-lung); readouts display potassium channel state, membrane potential, intracellular calcium, arteriole diameter, regional blood flow redistribution, and overall pulmonary artery pressure.
Did you know that hypoxic pulmonary vasoconstriction is essentially the opposite of how every other blood vessel in your body responds to low oxygen, and that this single reflex is a major reason why people who move to high altitude can develop elevated pulmonary artery pressure and, over years, measurable thickening of the right side of their heart?
This simulator demonstrates how falling alveolar oxygen tension triggers closure of oxygen-sensitive potassium channels in pulmonary arteriole smooth muscle, driving calcium influx and vessel constriction, and how the scale of hypoxia, from a single alveolus to the entire lung, determines whether the reflex beneficially redirects blood flow or dangerously raises pulmonary artery pressure and right heart workload.
This simulator demonstrates how falling alveolar oxygen tension triggers closure of oxygen-sensitive potassium channels in pulmonary arteriole smooth muscle, driving calcium influx and vessel constriction, and how the scale of hypoxia, from a single alveolus to the entire lung, determines whether the reflex beneficially redirects blood flow or dangerously raises pulmonary artery pressure and right heart workload.
Adjust the oxygen level in one or more alveolar regions and observe the corresponding pulmonary arteriole respond in real time, tracking potassium channel state, membrane potential, intracellular calcium, and vessel diameter. Expand the hypoxic region from a small localized patch to the entire lung to see how blood flow redistribution and overall pulmonary artery pressure change as the reflex shifts from a protective, local adjustment to a widespread, pressure-raising response.
Did you know that hypoxic pulmonary vasoconstriction is essentially the opposite of how every other blood vessel in your body responds to low oxygen, and that this single reflex is a major reason why people who move to high altitude can develop elevated pulmonary artery pressure and, over years, measurable thickening of the right side of their heart?