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How do people cry?

How do people cry?
Minet junior school from Greater London (Age 5-14)

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One Response

  1. Behind each eyelid you have something known as a ‘lacrimal gland’ this produces ‘tears’ all the time. They are watery and act to clear bits of dust or debris from your eyes and lubricate them.

    At the same time two other systems secrete into your eye socket: the eye surface itself (conjunctiva goblet cells) secretes the inner layer of liquid film over you eyes which is a thin type of mucus that the ‘tears’ spread above; along the edge of your eyelid itself are small holes that open from the meibomian glands, these make a special oily layer over the tears that help stop them evaporating.

    The levels of tears that happens all the time is referred to as ‘basal tears’; if you get something in your eye ‘reflex tears’ happen where the lacrimal glands produce more liquid to help wash anything out; what we think of as crying or weeping due to emotions are termed ‘psychic tears’ again these are due to the lacrimal glands being stimulated to produce more liquid, these contain slightly different chemicals to normal basal tears.

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