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Semelhante a 7.1 human breathing system
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7.1 human breathing system
- 2. What makes us yawn?
- 3. What makes us yawn?
- 4. What makes us yawn?
- 5. Which part of our body are in action when we yawn ?
- 6. Where does the exchange of oxygen and carbon dioxide take place between our body and atmosphere ?
- 7. In what forms are oxygen and carbon dioxide carried around our body?
- 9. In very small organisms: O2 CO2 • diffuses across cell membrane
- 10. In larger organisms: O2 CO2 • cannot diffuse across body surface
- 11. In larger organisms: 1. breathing system (呼吸系統) - for gas exchange 2. transport system (運送系統) - for carrying gases to body cells
- 17. air nasal cavity pharynx larynx trachea
- 18. air bronchus bronchiole air sac
- 19. 1 Nostrils and nasal cavity i) Hairs •filter larger dust particles
- 20. 1 Nostrils and nasal cavity ii) Mucus-secreting cells traps dust particles & moistens air mucus
- 21. 1 Nostrils and nasal cavity iii) Ciliated epithelial cells Cilia sweep mucus with dust particles towards pharynx cilia
- 22. 1 Nostrils and nasal cavity iv) Capillaries •blood warms up air
- 23. Self Quiz! Which of the following structures is/are found in the nasal cavity? (1) ciliated epithelium (2) mucus-secreting cells (3) hairs A (1) only B (1) and (2) only C (1) and (3) only D (1), (2) and (3)
- 24. 2 Pharynx and larynx
- 25. 2 Pharynx and larynx pharynx larynx oesophagus trachea
- 26. 2 Pharynx and larynx food larynx oesophagus
- 27. 2 Pharynx and larynx 1 Tongue pushes food towards pharynx larynx oesophagus
- 28. 2 Pharynx and larynx 2 Soft palate moves up, preventing food from entering nasal cavity larynx oesophagus
- 29. 2 Pharynx and larynx 3 Larynx rises and epiglottis covers entrance to trachea, preventing choking larynx oesophagus
- 30. 2 Pharynx and larynx epiglottis larynx • made up of cartilage
- 31. 2 Pharynx and larynx vocal cords (聲帶) • can vibrate to produce sound
- 32. 2 Pharynx and larynx
- 33. 3 Trachea, bronchi and bronchioles trachea bronchus bronchioles
- 34. 3 Trachea, bronchi and bronchioles trachea bronchus bronchioles
- 35. 3 Trachea, bronchi and bronchioles lumen C-shaped cartilage • prevents collapse ciliated epithelial cell
- 36. 3 Trachea, bronchi and bronchioles Trachea Bronchi Bronchioles Ciliated Yes Yes Yes epithelial cells Mucus- Yes Yes Absent in secreting smaller cells bronchioles Capillaries Yes Yes Yes Cartilage C-shaped Circular Absent
- 37. Self Quiz! The trachea is supported by many C- shaped cartilages. These cartilages A trap dust particles and bacteria. B warm up the inhaled air. C vibrate and produce sound. D keep the trachea open for breathing.
- 38. Self Quiz! Mucus in the respiratory tract helps (1) warm up the air. (2) moisten the air. (3) trap the dust particles in the air. A (1) and (2) only B (1) and (3) only C (2) and (3) only D (1), (2) and (3)
- 39. 4 Air sacs •large respiratory surface air sac capillary
- 40. 5 Lungs •composed of bronchioles and air sacs •in thoracic cavity (胸腔)
- 41. 5 Lungs •protected by rib cage (肋骨籃) vertebral column (脊柱) ribs sternum cartilage (胸骨)
- 42. 5 Lungs intercostal diaphragm muscles • sheet of muscle
- 43. 5 Lungs
- 44. 5 Lungs rib intercostal muscle outer pleural membrane right inner pleural membrane lung pleural cavity
- 45. 5 Lungs •pleural cavity filled with pleural fluid (胸腺液) as lubricant (潤滑劑) right lung pleural cavity
- 46. Misconceptions !! Hairs are present inside the nasal cavity to filter air
- 47. Misconceptions !! Hairs are present at the nostrils of the nose to filter the incoming air
- 48. Misconceptions !! Dust particles are trapped by cilia inside the nasal cavity
- 49. Misconceptions !! Dust particles are trapped by mucus. The trapped dust particles are swept by the beating action of cilia to the pharynx where they are swallowed or coughed out
- 50. Self Quiz! The human breathing system consists of the respiratory tract and structures that aid breathing.
- 51. Self Quiz! Air flow along respiratory tract: nostrils nasal cavity pharynx larynx trachea bronchi bronchioles air sacs
- 52. Self Quiz! In the nostrils, hairs filter larger dust particles.
- 53. Self Quiz! In the lining of nasal cavity, trachea, bronchi and mucus-secreting cells bronchioles, mucus-secreting cells mucus secrete mucus to moisten the air.
- 54. Self Quiz! In the lining of nasal cavity, trachea, bronchi and bronchioles, mucus mucus traps the dust particles and bacteria.
- 55. Self Quiz! In the lining of nasal cavity, trachea, bronchi and bronchioles, blood in the capillaries blood warms the incoming air.