![]() So when you have increased dead space, what you’ll see first is actually an increase in total minute ventilation (by increasing the breathing rate). The body normally tries to keep PaCO2 within a normal range, and will actively change the breathing rate, which directly changes V(total) and V(dead space), in order to achieve a suitable VCO2 that brings PaCO2 back to the normal level. The breathing rate isn’t the variable being fixed in practice, PaCO2 is. Now, that doesn’t really reflect what happens in a normal, healthy person. If you want to keep the amount of CO2 being removed (VCO2) constant, you need a higher starting amount of CO2 in the blood (higher PaCO2, which also means higher PACO2). That means how much CO2 you put into the air in each breath is determined by how much CO2 is in your blood.Īn increase in dead space means a reduction in effective ventilation (assuming a constant breathing rate). I assume you’re talking about the equation V(total) - V(dead space) = V(CO2) / PACO2.įor normal lungs, PACO2 is pretty much equivalent to PaCO2 (CO2 is very quickly exchanged between blood and air, it’s like pouring water at one end of a room and trying to measure the difference between water level at opposite ends - it’s gonna be pretty much equal). We make our world significant by the courage of our questions and by the depth of our answers. ![]() For more open-ended questions, try /r/AskScienceDiscussion | Sign up to be a panelist!.Looking for flair? Sign up to be a panelist!.Neuroscience, Neurology, Neurochemistry, Cognitive NeuroscienceĪsk Anything Wednesday - Economics, Political Science, Linguistics, AnthropologyĪskScience AMA Series: NASA Software CatalogĪsk Anything Wednesday - Physics, Astronomy, Earth and Planetary ScienceĪsk Anything Wednesday - Engineering, Mathematics, Computer scienceĪsk Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Medicine, Oncology, Dentistry, Physiology, Epidemiology, Infectious Disease, Pharmacy, Human Body Psychology, Cognitive Psychology, Developmental Psychology, Abnormal, Social Psychology Social Science, Political Science, Economics, Archaeology, Anthropology, Linguisticsīiology, Evolution, Morphology, Ecology, Synthetic Biology, Microbiology, Cellular Biology, Molecular Biology, Paleontology Mechanical Engineering, Electrical Engineering, Structural Engineering, Computer Engineering, Aerospace EngineeringĬhemistry, Organic Chemistry, Polymers, Biochemistry Mathematics, Statistics, Number Theory, Calculus, AlgebraĪstronomy, Astrophysics, Cosmology, Planetary FormationĬomputing, Artificial Intelligence, Machine Learning, ComputabilityĮarth Science, Atmospheric Science, Oceanography, Geology Theoretical Physics, Experimental Physics, High-energy Physics, Solid-State Physics, Fluid Dynamics, Relativity, Quantum Physics, Plasma Physics /r/AskScienceDiscussion: For open-ended and hypothetical questions.FAQ: In-depth answers to many popular questions.Weekly Features: Archives of AskAnything Wednesday, FAQ Fridays, and more!.Be civil: Remember the human and follow Reddiquette.Report comments that do not meet our guidelines, including medical advice.Downvote anecdotes, speculation, and jokes.Upvote on-topic answers supported by reputable sources and scientific research.Answer questions with accurate, in-depth explanations, including peer-reviewed sources where possible.Please read our guidelines and FAQ before posting
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