What is the primary function of lacrimal glands?

The primary function of lacrimal glands is to produce tears. These glands are located in the upper outer corner of each eye and are responsible for the secretion of a fluid that not only lubricates the eyes but also serves to keep the surface of the eye moist and clear of debris. Tears play a crucial role in maintaining eye health by providing nutrients, delivering antibodies, and removing irritants.

Beyond basic lubrication, tears also have an important emotional aspect, as they are produced in response to various stimuli, including feelings of sadness or happiness. This function highlights the dual role of lacrimal glands in both physiological maintenance and emotional expression.

While the other options touch on aspects related to eye function, they do not directly pertain to the specific role of lacrimal glands. Mucus is produced by different glands in the mucous membranes, pupil size is controlled by muscles of the iris, and protection against light is a broader function managed through other eye structures like the eyelids and iris.