respiratory system: bronchiole and bronchi, diaphragm, trachea, alveoli and cross-section of the lungs. Vector illustration for your design and medical use. human anatomy. silhouette of a man on white background.

Human respiratory system Human respiratory system model is show Lungs. Human physical model for education of anatomy.3D Render Medical lung inner structure. Human respiratory system Human respiratory system and breathing concept theme with anatomical lungs isolated on black background with high.

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Nose and nasal cavity. Forming the main external opening of the respiratory system, the nose protects the anterior portion of the nasal cavity. The nose is also unique, as it is the only part of the system that is externally visible. The nasal cavity is the uppermost part of the respiratory system, divided into two by the nasal septum.

The nasal cavity is the uppermost part of the respiratory system, divided into two by the nasal septum. It is the best entrance for outside air, as hairs and mucus line the inside wall and operate as air cleansers.

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