Respiratory System.

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Presentation transcript:

Respiratory System

Respiratory System Functions Gas exchange: Oxygen enters blood and carbon dioxide leaves Regulation of blood pH: Altered by changing blood carbon dioxide levels Voice production: Movement of air past vocal folds makes sound and speech Olfaction: Smell occurs when airborne molecules drawn into nasal cavity Protection: Against microorganisms by preventing entry and removing them

Respiratory System Divisions Upper tract Nose, pharynx and associated structures Lower tract Larynx, trachea, bronchi, lungs

Nose and Pharynx Nose: Functions Passageway for air Cleans the air Humidifies, warms air Smell Along with paranasal sinuses are resonating chambers for speech Pharynx Common opening for digestive and respiratory systems Three regions Nasopharynx Oropharynx Laryngopharynx

Larynx Functions Maintain an open passageway for air movement Epiglottis and vestibular folds prevent swallowed material from moving into larynx Vocal folds are primary source of sound production

Vocal Folds

Trachea Windpipe Divides to form Primary bronchi Insert Fig 23.5 all but b

Tracheobronchial Tree

Bronchioles and Alveoli

Lungs Two lungs: Principal organs of respiration Right lung: Three lobes Left lung: Two lobes Divisions Lobes, bronchopulmonary segments, lobules