Respiratory Lecture - RESPIRATORY SYSTEM RESPIRATORY SYSTEM...

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Unformatted text preview: RESPIRATORY SYSTEM RESPIRATORY SYSTEM Respiration exchange of gases between living cells in the environment 1. Pulmonary ventilation: breathing movement of air into and out of lungs 2. Gas exchange: diffusion of oxygen and carbon dioxide between blood and lungs diffusion of oxygen and carbon dioxide between blood and cells 3. Gas pickup and transport: transport of oxygen and carbon dioxide in the blood System Brief Structures: Organs of the Respiratory System The respiratory system consists of the upper respiratory tract above vocal cords Nose, nasal cavity, paranasal sinuses, pharynx and the lower respiratory tract below vocal cords Larynx, trachea, bronchi, bronchioles, alveoli External nares Nasal cavity Vestibule Superior, middle and inferior nasal conchae Hard and soft palates Nasal mucosa The nose and nasal cavity consists of: Figure 23.2 The Respiratory Epithelium of the Nasal Cavity and Conducting System Pharynx: Three Divisions of the Throat 1. Nasopharynx passage for air only. 2. Oropharynx 3. Laryngopharynx passageways for both air and food. Larynx: The Voicebox 1. The larynx conducts air between the pharynx and the trachea, prevents foreign objects from entering the trachea, and produces sound. Larynx: The Voicebox 2. Composed of muscle and cartilage, the larynx is lined with mucous membrane. The thyroid cartilage (Adams apple) is the largest and most anterior cartilage of the larynx. Larynx: The Voicebox 3. The epiglottis is the uppermost cartilage. It covers the larynx during swallowing. Larynx: The Voicebox 4. Air passes through the glottis and causes vocal cords to vibrate, thereby producing sound. vibrate, thereby producing sound....
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Respiratory Lecture - RESPIRATORY SYSTEM RESPIRATORY SYSTEM...

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