BSCI 202 Lecture Notes - Lecture 5: Fetus, Frontal Bone, Paranasal Sinuses

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Structures of the thoracic cavity: chest wall is air tight, protects lungs, rib cage, sternum, thoracic vertebrae. Lecture 5: the respiratory system: muscles = internal/external intercostals, diaphragm, pleura = membrane lining of lungs and chest wall, pleural sac around each lung. Intrapleural space filled with intrapleural fluid: volume = 15 ml. Nasal cavity: olfactory receptors located in the mucosa of superior surface, remainder of the cavity is lined with respiratory mucosa, moistens air, traps incoming foreign particles, lateral walls have projections called conchae. Larynx (voice box: routes air and food into proper channels, plays a role in speech. Bronchial (respiratory) tree divisions: all but the smallest of these passageways have reinforcing cartilage in their walls, primary bronchi, secondary bronchi, tertiary bronchi, bronchioles, terminal bronchioles, branching allows for continual flow and minimal resistance. Rate of diffusion: between alveoli and blood = rapid, small diffusion barrier, large surface area, membrane must be moist.

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