The secretion of neurotransmitters out of the nerve cell from small vesicles at the end of the axon can be considered an example of

The secretion of neurotransmitters out of the nerve cell from small vesicles at the end of the axon can be considered an example of exocytosis

Pupil, Iris, Sclera, Cornea, Lens Retina, Optic Nerve.

I only know those are the main seven sections but if you need to go more in dept I recommend finding some health books! I hope this helps :)