how does the food reaches to the small intestine when we sleep at night just after having dinner, which is against the gravity as the food has to go parallel to the earth surface?
In: Biology
This is answered but I wanted to point out this is why we tested the safety of space travel on dogs and monkeys and not birds. Birds lack peristalsis and rely on gravity to swallow, so they’d die of hunger and dehydration before achieving useful science.
I guess this response assumes you know that that we historically used birds to test for safety, like in mining operations. Dead bird = get the fuck out of the mine.
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