AQA GCSE PE - Respiratory System

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Across
  1. 2. The substance in the red blood cells which transports oxygen (as oxyhaemoglobin) and carbon dioxide.
  2. 5. The first structure of the upper respiratory system to receive inhaled air from the nose
  3. 6. _______ exchange The process that occurs in the alveoli of the lungs that involves gas being transported down its concentration gradient into the blood
  4. 7. The process of breathing air out of the lungs
  5. 10. Muscles situated in-between the ribs that are responsible for helping to alter the size of the thoracic cavity
  6. 13. A sheet of involuntary skeletal muscle that assists with breathing by contracting to alter the size of the thoracic cavity
Down
  1. 1. Smaller branches of airways that connect the bronchus to the alveoli
  2. 3. The process of breathing air into the lungs
  3. 4. The passive transport of gas down its concentration gradient between the alveoli and the blood
  4. 8. Split into the left and right, these are the largest airways in the lungs and connect the trachea to the bronchioles
  5. 9. Small air-filled sacs that act as the site of gas exchange in the lungs
  6. 11. A hollow passage surrounded by cartilage that connects the upper and lower respiratory systems and provides a passage for air to enter the lungs
  7. 12. The concentration difference between gases in the blood and the alveoli or muscles