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At the microscopic level, the arrangement and function of the nerves and muscles that serve the eyelid allow for its quick action and retreat.
Much of the study of physiology centers on the body’s tendency toward homeostasis.
This is the result of humans having ancestors that began walking on their hind limbs rather than using all four limbs.
Then, the saliva mixes with food and forms a bolus, a small rounded mass that can be easily swallowed.
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