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Respiratory System Take a deep breath and relax. Structure Nose Pharynx Larynx Trachea Bronchi Alveoli Lungs.

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Presentation on theme: "Respiratory System Take a deep breath and relax. Structure Nose Pharynx Larynx Trachea Bronchi Alveoli Lungs."— Presentation transcript:

1 Respiratory System Take a deep breath and relax

2 Structure Nose Pharynx Larynx Trachea Bronchi Alveoli Lungs

3 Nose- lined with mucous membranes. Air is warmed, filter and moistened Pharynx or throat- 3 sections: upper, middle and lower. Esophagus branches off here Larynx- voicebox. Epiglottis closes the opening during swallowing Trachea- windpipe, lined with c-shaped cartilaginous rings

4 Bronchi (singular bronchus)- left and right Bronchioles- smaller divisions of the bronchi Bronchioles end in small air sacs called alveoli 500 million alveoli- one sqamous cell layer thick

5

6 Lungs: 2 unequal lobes Covered in a membrane called the pleura

7 Breathing = ventilation Two stages: inspiration and experation Diaphragm and intercostal muscles contract, thoracic cavity enlarges

8 External respiration: exchange of O2 and CO2 between lungs and bloodstream Internal respiration: exchange of CO2 and O2 between cells and bloodstream

9 Asthma Bronchitis COPD- chronic obstructive pulmonary disease Emphysema Influenza Laryngitis Lung cancer Tuberculosis


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