Parts and Function of Respiratory System - Grade 9 Science
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The respiratory system is responsible for the process of breathing, which includes inhalation (drawing air in) and exhalation (expelling air). Key components of this system include the nose, pharynx, larynx, trachea, bronchi, bronchioles, lungs, alveoli, and diaphragm, each serving specific functions in respiration. Oxygen enters the lungs through these structures and is exchanged for carbon dioxide in the alveoli.
Parts and Function of Respiratory System - Grade 9 Science
- 2. Breathing • Process of drawing air into the lungs (inhalation) and its corresponding expulsion (exhalation). • During inhalation, oxygen enters the lungs and during exhalation, carbon dioxide exits the lungs.
- 3. Parts of Respiratory System • Nose • Pharynx • Larynx • Trachea • Bronchi • Bronchial trees • Bronchioles • Lungs • Air sacs/Alveoli • Diaphragm
- 4. Parts of Respiratory SystemNose Bronchi Lungs Trachea Bronchial trees Air sacs Diaphragm Pharynx Larynx Bronchioles
- 5. Nose • Gateway of the respiratory system. • Cilia- hairs that trap foreign materials unnecessary for lungs. • Mucous Membranes- moisten the air before it enters.
- 6. Pharynx or Throat • Narrow space located right after the mouth and the nose. • Nasopharynx- part of the pharynx that is related to respiration.
- 7. Larynx or Voice Box • Organ that connects pharynx and trachea. • It contains vocal chords that produce sounds when vibrated by the air.
- 8. Trachea • Narrow and cylindrical tube. • 5 inches long. • Passageway of air going in and out the lungs.
- 9. Bronchi, Bronchi trees, Bronchioles • Bronchi- trachea splits into two bronchi which insert to the lungs. • Bronchi Trees- subdivision of bronchi inside the lungs. • Bronchioles- connected to air sacs.
- 10. Air Sacs • Functioning system of lungs. • Alveoli- inhaled oxygen passes through it and then diffuses into capillaries.
- 11. Lungs • Cone-shaped organs. • Pleura- two-layered membrane that covers the lungs. • Hilum- slit like opening in the lungs where bronchi are inserted.
- 12. Diaphragm • Sheet of smooth muscle located below the lungs. • It works with lungs during breathing process.