Mechanical Factors 。Mucous membranes Ciliary escalator:Microbes trapped in mucus are transported away from the lungs Lacrimal apparatus:Washes eye Saliva:Washes microbes off 。Urine:Flows out Vaginal secretions:Flow out • Mucous membranes • Ciliary escalator: Microbes trapped in mucus are transported away from the lungs • Lacrimal apparatus: Washes eye • Saliva: Washes microbes off • Urine: Flows out • Vaginal secretions: Flow out Mechanical Factors