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The Human Respiratory System. Respiratory System. Respiratory Structures. Diaphragm Contraction = inhalation Relaxation = exhalation Pharynx Common nasal/oral passageway Larynx “ Voicebox ” containing vocal cords Trachea “Windpipe” leading to lungs Bronchi/bronchioles

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respiratory structures
Respiratory Structures
  • Diaphragm
    • Contraction = inhalation
    • Relaxation = exhalation
  • Pharynx
    • Common nasal/oral passageway
  • Larynx
    • “Voicebox” containing vocal cords
  • Trachea
    • “Windpipe” leading to lungs
  • Bronchi/bronchioles
    • Tubes that enter each lung
  • Alveoli
    • (1) Millions of capillary‑surrounded sacs where oxygen transfer takes place
oxygen transport
Oxygen Transport
  • Hemoglobin
    • Protein found in red blood cells
    • Iron in hemoglobin is capable of weakly binding oxygen
  • Oxyhemoglobin
    • Hemoglobin with oxygen bound to it
    • Oxygen is given up when oxygen concentration around cells gets low
carbon dioxide transport
Carbon Dioxide Transport
  • Transport
    • 10% is dissolved CO2 in the plasma
    • 90% is carried as bicarbonate ion (HCO3-) in the plasma
  • Elimination
    • In lungs, bicarbonate is converted back to CO2
    • CO2 diffuses into alveoli and is eliminated