Ms. He's Respiratory system

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  • Anyone wants to summarize the direction of gas exchange based on this diagram?
  • Diaphragm – skeletal muscles
  • What is lung used for?


  • 1. Respiratory System
  • 2. BIG IDEACirculatory system supplies entire body withoxygenated bloodRespiratory system supplies blood with oxygen • Respiratory Tract • Gas exchange • Breathing
  • 3. Respiratory Tract• Nasal (or oral) cavity• Pharynx• Larynx• Trachea• Bronchi• Bronchiole• Alveoli
  • 4. Nasal Cavity3 main functions:• Cleans the air• Warms the air• Moistens the air
  • 5. Pharynx (throat) • The place where the nasal cavity, esophagus (digestive tract) and trachea (respiratory tract) meet • Epiglottis is the door that allows food to go down the esophagus (digestive tract) and air down the trachea (respiratory tract)
  • 6. Larynx (voice box)• Houses the vocal cords• Vibrations of the cords produces sound• Prevent food to go down the trachea
  • 7. Larynx Cartilages• Soft bone that provide structural support to Larynx
  • 8. Trachea (windpipe)• Composed of cartilage (soft bone)• Helps maintains rigidity to prevent the respiratory passage from collapsing
  • 9. Bronchi• Bronchi branch into smaller bronchiole eventually ending at the alveoliWhy does Tracheabranches into 2bronchi? Left and Right lung
  • 10. Bronchi
  • 11. Alveoli Why high surface area• Spherical hollow is needed? cavities increase surface area• Walls are only 1 cell thick making it easy for rapid diffusion
  • 12. Alveoli• Why capillaries are two colored?• What material is exchanged? Capillaries line the alveoli for gas exchange
  • 13. Gas Exchange Which direction does blood flow?
  • 14. Alveoli: Gas Exchange Oxygen goes into the blood vessel. Carbon dioxide (a waste product) leaves the blood vessel into the alveolus.
  • 15. Respiration Summary
  • 16. BreathingProcess• Inhalation: taking air into the lungs• Exhalation: breathing out airMuscles• Diaphragm (between lung and stomach)• Ribcage muscles
  • 17. Ribs & Diaphragm RibsDiaphragm
  • 18. Ribcage Muscles
  • 19. ModelModel of Respiration
  • 20. Breathing
  • 21. Breathing Ribcage Rib Internal Process Diaphragm Volume Air Muscles Cage Pressure Contract Expand (moves MovesInhalation Contract (up and Increase Decrease down) in out) Flattens Relax Reduce (moves up) MovesExhalation Relax (down Decrease Increase Dome- out and in) shaped
  • 22. Breathing• Involuntary• Can override system temporarily (e.g. hold our breath)• Breathing rate determined by amount of carbon dioxide detected in blood• When carbon dioxide increases, breathing rate increases, heart beats faster to let in more oxygen