How does the body create a difference between atmospheric and intrapulmonary pressures to cause air flow to and from the lungs

Which organelles are labeled d, and what is one feature that distinguishes them from the other labeled organelles chloroplasts the only organelles that produce sugars from sunlight mosomes, only found in animal and bacterial cells centricles only found in animal cells mitochondra, the only energo-generating structures found in cells

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What substance acts to prevent sudden ph changes in bodily fluids?