What is the meaning of the pupil? How is his work regulated?

The pupil regulates the level of light entering the interior of the eye, and is a hole in the iris, the diameter of which changes reflexively. The work of the pupil is regulated by the nervous system and hormones, depending on the state of the body and light illumination.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.