Lacrimal glands are responsible for which of the following?

Lacrimal glands are specifically responsible for the production of tears, which play a vital role in maintaining the health of the eye. Tears provide moisture and lubrication, helping to keep the surface of the eye clean and free from irritants. The lacrimal glands secrete a fluid that contains water, electrolytes, proteins, and enzymes, ensuring proper functioning of the eye and protection against infection. This physiological function is crucial for clear vision and overall eye health.

The other options pertain to different anatomical structures and functions related to the eye. For example, zonules are fibers that support the lens, pupil size regulation is controlled by muscles in the iris, and eye movement is facilitated by extraocular muscles, none of which are the primary function of the lacrimal glands.