Respiratory System with slides and notes

Respiratory System with slides and notes - 22:20:00 ←...

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Unformatted text preview: 27/10/2007 22:20:00 ← QuickTime  and a TIFF (LZW) decompressor are needed to see this picture. Human Respiratory system is over developed, to work for exercise, endurance/distance running ← QuickTime and a TIFF (LZW) decompressor are needed to see this picture. 3 million alveoli in an adult ← Inspiration – air into body ← Expiration – air out of body ← At rest 4L of air enters and leaves alveoli/minute ← Vocal cords are in larynx ← Upper airways = nose, mouth, pharynx, larynx ← Rings of cartilage------------------------------- ← ← Conduction Zone • Top of trachea to the beginning of respiratory bronchioles • No alveoli • No gas exchange ← Respiratory Zone • Respiratory bronchioles down • Contain alveoli and exchange gases ← Airway epithelium secretes water fluid mucous can ride freely on ← Cystic Fibrosis • Production of fluid is impaired in disease • Most common lethal genetic disease in Caucasians • Mucous layer becomes thick and dehydrated • Airways obstructed • Cl channel defect ← Protective mechanisms • Constriction of bronchioles in response to irritation – prevent entrance to site of gas exchange • Macrophages – engulf and destroy inhaled particles and bacteria ← Pulmonary circulation has low resistance as compared to systemic circulation ← Pressure within all pulmonary blood vessels are low ← QuickTime and a TIFF (LZW) decompressor are needed to see this picture. Alveoli = site of gas exchange • tiny hollow sacs whose open ends are continuous with lumen of airways ← Alveolar walls • Type 1 Alveolar cells – flat cells which make up most of alveolar walls • Type 2 specialized – produce surfactant o Some have pores that permit airflow btwn alveoli • Capillaries • Very little interstitial space o Filled with connective tissue and fluid ← Total surface area of alveoli in contact with capillaries roughly the size of a tennis court • Permits rapid exchange of large quantities of O2 and CO2 ←...
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Respiratory System with slides and notes - 22:20:00 ←...

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