The main lubricating substances in the body include synovial fluid, mucus, and serous fluid. These substances are produced by specialized cells and tissues to ensure minimal friction during movement.
- Synovial Fluid: This is a viscous fluid found in joint cavities. It is secreted by synovial membranes and contains hyaluronic acid and lubricin, which reduce friction between articular cartilages. - Mucus: Produced by goblet cells and mucous glands, mucus lubricates and protects epithelial surfaces in the respiratory, digestive, and reproductive systems. - Serous Fluid: Found in serous cavities like the pleura, peritoneum, and pericardium, this fluid is secreted by mesothelial cells and reduces friction between organs.
