What part of the respiratory system serves as a filtering system, keeping certain particles out of the lungs? the larynx

the nasal cavity

the trachea

the pharynx

The nose, pharynx, larynx, trachea and bronchi all work like a system of pipes through which the air is funnelled down into our lungs. There, in very small air sacs called alveoli, oxygen is brought into the bloodstream and carbon dioxide is pushed from the blood out into the air.

the trait of personality falls in the middle of the diagram because personality is a mixture of ones nature and environment.