THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The trachea serves as passage for air, moistens and warms it while it passes into the lungs, and protects the respiratory surface from an accumulation of foreign particles. The trachea is lined with a moist mucous-membrane layer composed of cells containing small hairlike projections called cilia.

Detailed explanation-2: -The correct answer is d. prevent food from entering the lungs. The trachea provides a pathway for air to enter and exit the lungs, and mucus secreted by the tracheal epithelium traps dust and debris to prevent it from entering the lungs.

Detailed explanation-3: -(TRAY-kee-uh) The airway that leads from the larynx (voice box) to the bronchi (large airways that lead to the lungs). Also called windpipe.