cardiorespiratory fitness and muscle contraction

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Across
  1. 4. the chemical which is produced when we metabolize sugar and is used to activate muscles
  2. 6. in these organs the blood receives oxygen from the air
  3. 7. what we call the muscle that opposes the agonist
  4. 10. 220 beats/min minus your age
  5. 12. this the amount of blood leaving the left ventricle during each contraction, usually about 70mL
  6. 14. the type of muscle contraction in which the muscle does not change length
  7. 16. a disease in which one loses bone density
  8. 17. the sugar rich carbohydrate found in fast twitch muscles
Down
  1. 1. the muscle in the upper leg that relaxes as the knee joint opens
  2. 2. what we call the muscle that is contracting to close a joint
  3. 3. the number of beats per minute
  4. 5. the muscle in the upper leg that contracts to open the knee joint
  5. 8. the type of metabolism that produces lactic acid
  6. 9. the type of metabolism the requires oxygen
  7. 11. this four chambered sits in the thoracic cavity
  8. 13. the best measurement of cardiovascular fitness
  9. 15. a blood vessel that carries blood away from the heart