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RESPIRATORY SYSTEM

The respiratory system provides oxygen to cells and tissues through its conducting and respiratory portions, comprising components like nasal cavity, larynx, tracheo-bronchial tree, and pulmonary alveoli. The specialized epithelium includes ciliated, goblet, basal cells, and an olfactory area. The bronchiolar and alveolar epithelia consist of various cell types contributing to the respiratory barrier.

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RESPIRATORY SYSTEM

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  1. RESPIRATORY SYSTEM

  2. Respiratory system is responsible for oxygen supply of cells and tissues It includes conducting portion • Nasal cavity • Nasopharynx • Larynx • Tracheo-bronchial tree And respiratory portion • Pulmonary alveoli

  3. Respiratory type epithelium – pseudostratified ciliated • Ciliated cells • Goblet cells • Basal cells Specialized olfactory area • Olfactory cells (modified bipolar neurons) with knobs (olfactory vesicles) and hair-like processes (olfactory cilia) • Supporting (sustentacular) cells • Basal cells

  4. Tracheo-bronchial epithelium • Ciliated cells (30%) • Goblet cells (30%) • Basall cells (30%) • Brush border cells (3%) • Diffuse neuroendocrine (APUD) cells (3%) • Serous cells (4%)

  5. Bronchiolar epithelium • Ciliated cells • Clara cells • Basal cells

  6. Alveolar epithelium • Pneumocytes type I (respiratory) • Pneumocytes type II (secretory) • Alveolar macrophages Respiratory barrier

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