What are the functions of mucus?

1. Lubrication: Mucus helps to lubricate and moisten the surfaces of the respiratory, digestive, and reproductive systems, making it easier for substances to pass through these pathways.

2. Protection: Mucus acts as a protective barrier against pathogens, irritants, and foreign particles by trapping them and preventing them from entering the body.

3. Immune defense: Mucus contains antibodies, enzymes, and other immune cells that help to fight off infections and maintain the health of the mucous membranes.

4. Removal of waste: Mucus helps to remove waste products, dead cells, and other debris from the body by trapping them and carrying them out of the body through coughing, sneezing, swallowing, or other means.

5. Temperature regulation: Mucus helps to regulate the temperature of the body by trapping heat and moisture, which can help to maintain a stable internal environment.

- Protection: Mucus forms a protective barrier over the surfaces of organs and tissues, shielding them from pathogens, toxins, and other harmful substances.
- Lubrication: Mucus helps to lubricate surfaces, reducing friction and facilitating movement. For example, mucus in the respiratory tract helps to move air in and out of the lungs.
- Moisturization: Mucus helps to keep surfaces moist, which is important for proper functioning. For example, mucus in the nasal passages helps to keep the membranes moist and prevents them from becoming dry and irritated.
- Trapping of particles: Mucus helps to trap particles, such as dust, pollen, and bacteria, preventing them from entering the body. For example, mucus in the nasal passages helps to trap allergens and prevent them from reaching the lungs.
- Immune defense: Mucus contains antimicrobial substances that help to protect the body from infection. For example, mucus in the respiratory tract contains antimicrobial peptides that help to kill bacteria.

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