Tears
Tears are a transparent fluid secreted primarily by the lacrimal glands found in the eyes of all land mammals. According to the mode of production, tears are classified into four types: basal, closed eye, emotional, and reflex. The basal rate of tear secretion is ~0.5–2.2 µL/min, and irritation can increase secretion by up to ~100-fold, reaching ~300 µL/min. Tears are made up of water, electrolytes, proteins, lipids, and mucins that form layers on the surface of eyes. The four types of tears differ significantly in their composition.
Similar Artists