One choice they made in Cells at Work was showing the Red Blood Cells as the general "delivery people" of the body, bringing in O2 and removing CO2, delivering sugar from the stomach, etc You can see why they did it but it's a missed opportunity to look at some cool biology imo
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Because while this gives the anthropomorphic characters more to do, we don't actually need cells to "carry" most substances in blood They're just dissolved in blood plasma directly And obviously red blood cells don't "deliver" anything, they're moved around by the heart
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For most stuff that needs to be moved around the body just keeping the blood pumping is sufficient The cells themselves control what goes into (food) and comes out of them (waste) In fact in a lot of animals that's all it is - invertebrates don't have red blood cells
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Replying to @arthur_affect
One biology-type epiphany I had was when I went from thinking of bodies not as factories or engines but more like dense multilayered sieves
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Replying to @muddlewait
Yeah it was HG Wells I think who pointed out that, big picture, a human being (like any other chordate) is just a tube food goes through, and everything else we are is a support system for that
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(To talk about how much freer the Martians in War of the Worlds became when they severed themselves from most of their biology to become brains supported by machines)
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