Mucus is secreted by goblet cells and mucous glands located in various epithelial tissues. It consists of water, glycoproteins, and enzymes. In the respiratory tract, mucus traps dust and microorganisms, facilitating their removal via ciliary action. In the digestive tract, mucus protects the lining from digestive enzymes and acidic content. In the reproductive system, it aids in the movement of sperm and protects the vaginal and cervical linings.
