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ANATOMI DAN FISIOLOGI PERNAFASAN
Dr. Aidi Nasrul AKBID SUMBAR LUBUK ALUNG 2008
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Introduction to Pulmonary Physiology • The pulmonary system, in tandem with the cardiovascular system, works to carry out three functions: – Ventilation – Perfusion – Diffusion
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Anatomy
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Upper Airways • Structures – Nasopharynx – Oropharynx – Tongue – Epiglottis – Larynx • Function – Protection – Humidification – Filtration
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Lower Airways • Structures – – – –
Trachea Mainstem bronchi Bronchioles Terminal bronchioles
• Function – Filtration – Transmission of air
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Structural Considerations
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Structural Considerations • Cilia: beat 100 times/second • MAST cells secrete sticky substance filled with WBCs
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Alveolus • 100 million alveoli in each lung • Single cell thick wall • Immediately adjacent to pulmonary capillary • Gas exchanges via diffusion
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1. Ventilation • Definition: movement of air from the external environment to the alveoli • Components: • • • • •
Brain Innervation Chest wall Upper airways Lower airways
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Inspiration • Increased intrathoracic space • Negative pressure • Bronchioles dilate • Air enters airways/alveoli (unless a hole is present in the chest wall)
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Expiration • Diaphragm & intercostals relax • Thoracic space gets smaller • Increased intrathoracic pressure • Air passively exits via airways
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What Happens to the Airways? • Smooth-muscle lined airways (bronchioles) naturally change diameter with inspiration and expiration • (This will be important when we discuss obstructive lung disease)
Inspiration
Expiration
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2. Perfusion • Definition of perfusion: adequate blood flow through the pulmonary capillary bed • Components: – Intact pulmonary capillary bed – Adequate cardiac function – Adequate blood volume
R Heart
L Heart
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Pulmonary Capillary Bed May be damaged by: • Clots (pulmonary emboli) • Crushing injuries (pulmonary contusion)
R Heart
L Heart
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Cardiac Function • The pulmonary capillary bed is part of the cardiopulmonary circuit • Impairment of flow through any chamber or valve will impact pressures and flow
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Blood Volume • Adequate perfusion requires adequate blood volumes AND composition • Reduction of volume, or decreased/ inadequate RBCs will diminish perfusion
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3. Diffusion – Definition of diffusion: movement of gases between the alveoli and the pulmonary capillary bed – Components: • Alveolus • Basement membrane (interstitial space) • Capillary wall
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Diffusion? • The passive exchange of gases along a concentration gradient (high to low) • Exchange continues until the concentrations are equal
Before diffusion CO2
O2 CO2 O2
After diffusion O2 CO2
O2 CO2
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Diffusion?
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Basement Membrane • Includes the walls of the alveolus and capillary • Most importantly, includes the interstitial space between the walls of the capillary and alveoli • Drainage via lymphatics
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Capillary Wall • If capillary wall is thickened, diffusion will be impaired • If capillary wall is damaged, diffusion will be impaired
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Terima Kasih
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