Cardio-Respiratory System

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Across
  1. 2. – The main muscle involved in breathing, contracts to draw air into the lungs.
  2. 4. – The widening of blood vessels to increase blood flow.
  3. 7. – The number of times the heart beats per minute.
  4. 9. – Muscles between the ribs that assist in the expansion and contraction of the thoracic cavity.
  5. 12. – Specialized sensor that detects changes in blood CO₂, pH, and O₂ levels.
  6. 15. – The process of moving air into and out of the lungs.
  7. 16. – The blood pressure measured when the heart is relaxed between beats.
  8. 17. – The gas exchanged in the alveoli and transported to the muscles via red blood cells.
  9. 18. – Related to the lungs; describes circulation between the heart and lungs.
  10. 19. – Tiny air sacs in the lungs where gas exchange occurs.
Down
  1. 1. – The node that acts as the pacemaker of the heart by initiating electrical impulses.
  2. 3. – The smallest blood vessels where exchange of gases, nutrients, and wastes takes place.
  3. 5. – The maximum volume of air the lungs can hold (vital capacity + residual volume).
  4. 6. – Part of the brainstem that controls the basic rhythm of breathing.
  5. 8. – A blood vessel that carries blood away from the heart under high pressure.
  6. 10. – A protein in red blood cells that binds to and transports oxygen.
  7. 11. – Refers to the intercostal muscles that contract during inhalation to expand the chest.
  8. 13. – The amount of air inhaled or exhaled in a normal breath.
  9. 14. – The passive movement of gases from areas of high to low partial pressure.
  10. 15. – A blood vessel that carries blood toward the heart under low pressure.