PUPILS Meaning and
Definition
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Pupils refer to the small, round, and contractible openings in the center of the iris of the eye. They are often referred to as the "black" part of the eye as they appear darker than the surrounding colored iris. Pupils play a vital role in regulating the amount of light that enters the eye and reach the retina, which is responsible for visual perception.
The dilation and contraction of the pupils are controlled by the autonomic nervous system. In dim lighting conditions, the pupils dilate, allowing in more light to improve visibility. This response is triggered by the activation of radial muscles known as the iris dilator muscles. Conversely, in bright light, the pupils contract or constrict due to stimulation of circular muscles called the iris sphincter muscles. By narrowing the pupil opening, the amount of light entering the eye is reduced to protect the sensitive structures within the eye from excessive light exposure.
Pupillary reactions can also serve as indicators of various physiological and neurological conditions. For instance, the pupillary response can be used as an assessment tool to evaluate the overall health of the nervous system. An abnormal pupil size, shape, or response to light can be indicative of underlying medical conditions or injuries, necessitating further investigation and potential treatment.
Top Common Misspellings for PUPILS *
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Other Common Misspellings for PUPILS
Etymology of PUPILS
The word "pupils" originated from the Latin word "pupillus", which means "orphan". In ancient Rome, the term was used to refer to a child who had lost his or her parents. Over time, the meaning of "pupillus" extended to include any child under guardianship. Eventually, "pupillus" developed into the Old French word "pupil", which meant "orphan" or "ward", and then entered Middle English as "pupille". In English today, "pupils" refers to students or learners who are under the guidance and care of teachers or guardians.
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