Nose (nostrils), nasal cavities, internal nares, pharynx, larynx, trachea, bronchi, alveoli, and lungs (Figure 5) are the parts of human respiratory system. Various Parts of Respiratory System Nostrils These are paired external openings in nose that open into two nasal cavities. Nasal Cavities There are two nasal cavities present. These cavities are separated from each … Read More