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Grade 11 University Biology - Unit 4 Animal Systems Parts of the Respiratory System Section 11.2 Pages 450-454 ANSWERS Part Structure / Location Function Nasal cavity two nostrils lined with hairs brings air into the body, filters out large air-borne particles (e.g., dust) Pharynx end of naval cavity Trachea horse-shoe shaped tube cartilage ciliated and covered with mucus opening air passage way from pharynx Epiglottis small flap of tissue above the larynx covers the trachea opening to prevent food from entering the lungs Larynx cartilage chamber containing the vocal chords - held by muscle supports the epiglottis air flow into lungs Lungs pair of cone-shaped organs located in chest cavity allows body to take in air and remove carbon dioxide Bronchi complete cartilage rings (similar to trachea) carries air into the lungs Bronchioles small tubes that do NOT have cartilage, mucus of cilia transports air from bronchi to alveoli Alveoli microscopic air sacs that are singlecell thick, lined with capillaries gas exchange between air and blood Pleural membrane thin membrane, spaces between membranes are filled with fluid fluid reduces friction between lungs and chest cavity Diaphragm flat, dome-shaped sheet of muscle regulates air pressure in the chest Intercostal muscle muscle tissue attached to the ribs assists the diaphragm contracts / relaxes to enlarge / shrink the volume of the chest Grade 11 University Biology - Unit 4 Animal Systems Parts - Respiratory System Section 11.2 Pages 450-454 Using Section 11.2 in your textbook, complete the following table about the human respiration system. Part Nasal cavity Pharynx Trachea Glottis Larynx Lungs Bronchus Bronchioles Alveoli Pleural membrane Diaphragm Intercostal muscle Hemoglobin Structure / Location Function
