The process by which cells or glands produce and release substances, or the substance itself that is produced. These substances serve various biological functions like digestion, protection, or communication.
From Latin 'secretio' meaning 'a separation', from 'secernere' meaning 'to separate, set apart'. The biological sense developed in the 17th century as understanding of glandular functions advanced.
Human bodies produce hundreds of different secretions - from obvious ones like saliva and sweat to fascinating ones like the waxy coating in our ears that has antimicrobial properties. Each secretion is a precisely formulated chemical cocktail designed for specific biological tasks!
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