Notes: Lower Respiratory Tract (pg 6)
Trachea (windpipe)• Tube 12-15 cm long. Anterior and lateral walls  are supported by 15 to 20 C-shaped pieces of  hyaline ...
Trachea (windpipe)• Tube 12-15 cm long. Anterior and lateral walls  are supported by 15 to 20 C-shaped pieces of  hyaline ...
Lungs• Soft and spongy because they are mostly  empty space
Lungs• Soft and spongy because they are mostly  empty space• Rest on the diaphragm and extend upward to  the clavicle
Lungs• Soft and spongy because they are mostly  empty space• Rest on the diaphragm and extend upward to  the clavicle• Onl...
Lungs• Soft and spongy because they are mostly  empty space• Rest on the diaphragm and extend upward to  the clavicle• Onl...
Lungs• Soft and spongy because they are mostly empty  space• Rest on the diaphragm and extend upward to the  clavicle• Onl...
Lungs• Soft and spongy because they are mostly empty  space• Rest on the diaphragm and extend upward to the  clavicle• Onl...
Bronchi and Bronchial Tree• Trachea divides into right and left primary  bronchi
Bronchi and Bronchial Tree• Trachea divides into right and left primary  bronchi• Primary bronchi enter lungs and branch t...
Bronchi and Bronchial Tree• Trachea divides into right and left primary  bronchi• Primary bronchi enter lungs and branch t...
Output (pg 7)Draw the previous diagram from memory and  label the following parts• Bronchiole• Alveolar duct• Alveoli• Cap...
Alveoli (pg 6)• Site of gas exchange between lungs and blood• Walls of alveoli are only 1 cell thick and they  are surroun...
Alveoli (pg 6)• Site of gas exchange between lungs and blood• Walls of alveoli are only 1 cell thick and they  are surroun...
Alveoli (pg 6)• Site of gas exchange between lungs and blood• Walls of alveoli are only 1 cell thick and they are  surroun...
Output (pg 5)Paste in the diagram “Gas exchange in the  Alveoli”Color code• Red blood cells: Red• Hemoglobin: Orange• Oxyg...
Lower respiratory tract
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Lower respiratory tract

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Lower respiratory tract

  1. 1. Notes: Lower Respiratory Tract (pg 6)
  2. 2. Trachea (windpipe)• Tube 12-15 cm long. Anterior and lateral walls are supported by 15 to 20 C-shaped pieces of hyaline cartilage that hold trachea open.
  3. 3. Trachea (windpipe)• Tube 12-15 cm long. Anterior and lateral walls are supported by 15 to 20 C-shaped pieces of hyaline cartilage that hold trachea open.• Posterior portion is smooth muscle (no cartilage) allowing room for the esophagus, which sits behind the trachea, to expand during swallowing.
  4. 4. Lungs• Soft and spongy because they are mostly empty space
  5. 5. Lungs• Soft and spongy because they are mostly empty space• Rest on the diaphragm and extend upward to the clavicle
  6. 6. Lungs• Soft and spongy because they are mostly empty space• Rest on the diaphragm and extend upward to the clavicle• Only point of attachment is the hilum, where bronchi, blood vessels, and nerves enter
  7. 7. Lungs• Soft and spongy because they are mostly empty space• Rest on the diaphragm and extend upward to the clavicle• Only point of attachment is the hilum, where bronchi, blood vessels, and nerves enter• Right lung is shorter, broader, and has a greater volume. 3 lobes.
  8. 8. Lungs• Soft and spongy because they are mostly empty space• Rest on the diaphragm and extend upward to the clavicle• Only point of attachment is the hilum, where bronchi, blood vessels, and nerves enter• Right lung is shorter, broader, and has a greater volume. 3 lobes.• Left lung is longer and narrower and has an indentation called the cardiac notch that makes room for the heart. 2 lobes.
  9. 9. Lungs• Soft and spongy because they are mostly empty space• Rest on the diaphragm and extend upward to the clavicle• Only point of attachment is the hilum, where bronchi, blood vessels, and nerves enter• Right lung is shorter, broader, and has a greater volume. 3 lobes.• Left lung is longer and narrower and has an indentation called the cardiac notch that makes room for the heart. 2 lobes.• Each lung is enclosed by a double layered serous membrane called the pleura.
  10. 10. Bronchi and Bronchial Tree• Trachea divides into right and left primary bronchi
  11. 11. Bronchi and Bronchial Tree• Trachea divides into right and left primary bronchi• Primary bronchi enter lungs and branch to form secondary (lobar) bronchi, which branch into tertiary (segmental) bronchi
  12. 12. Bronchi and Bronchial Tree• Trachea divides into right and left primary bronchi• Primary bronchi enter lungs and branch to form secondary (lobar) bronchi, which branch into tertiary (segmental) bronchi• Branching continues to form bronchioles, which branch into microscopic alveolar ducts. The ducts terminate in clusters of tiny air sacs called alveoli• Lungs have around 300 million alveoli
  13. 13. Output (pg 7)Draw the previous diagram from memory and label the following parts• Bronchiole• Alveolar duct• Alveoli• Capillaries
  14. 14. Alveoli (pg 6)• Site of gas exchange between lungs and blood• Walls of alveoli are only 1 cell thick and they are surrounded by capillaries. Oxygen diffuses into the blood and CO2 diffuses out, driven by concentration gradients.
  15. 15. Alveoli (pg 6)• Site of gas exchange between lungs and blood• Walls of alveoli are only 1 cell thick and they are surrounded by capillaries. Oxygen diffuses into the blood and CO2 diffuses out, driven by concentration gradients.• Oxygen Transport: 97% carried by heme portion of hemoglobin in RBCs, 3% dissolved in blood plasma
  16. 16. Alveoli (pg 6)• Site of gas exchange between lungs and blood• Walls of alveoli are only 1 cell thick and they are surrounded by capillaries. Oxygen diffuses into the blood and CO2 diffuses out, driven by concentration gradients.• Oxygen Transport: 97% carried by heme portion of hemoglobin in RBCs, 3% dissolved in blood plasma• Carbon Dioxide Transport: 70% bicarbonate ions in RBC cytoplasm, 23% carried by protein portion of hemoglobin, 7% dissolved in blood plasma
  17. 17. Output (pg 5)Paste in the diagram “Gas exchange in the Alveoli”Color code• Red blood cells: Red• Hemoglobin: Orange• Oxygen: Green• Carbon dioxide: Blue• Blood plasma: Yellow

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