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chp 24 - Chapter 24 Respiratory System Functions of...

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Chapter 24 Respiratory System
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Functions of respiratory system Site of O2 and CO 2 exchange btwn atmosphere and blood Filters/ moistens /warms inhaled air Receptors for smell Production of sound Plays a role in regulating pH
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Anatomical divisions Upper respiratory tract Nose, nasal cavity, pharynx (tonsils) Lower respiratory tract Larynx, trachea, bronchi, lungs In medicine, cutoff for upper and lower respiratory tract (e.g. infections) is vocal cords Fig. 24.1
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Functional divisions Conducting zone Structures that filter, warm, moisten and carry air into lungs Nose terminal bronchioles Mucus membranes ( goblet cells) Respiratory zone Structures where gas exchange with blood occurs Respiratory bronchioles, alveoli
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Nose/nasal cavity Nose is cartilage/bone Nasal vestibule has hairs to trap large particles Nasal conchae (3) in nasal cavity surf. area Moist mucosa to humidify air
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Fig. 24.3
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Pharynx (throat) 3 regions Naso- Oro- Laryngo- Passagemway for air and food/fluids Tonsils found here
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Fig. 24.3
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