As people age, they become unable to control their cardiorespiratory fitness levels.
  • F
  • Slow-twitch muscles are able to use oxygen more efficiently than fast-twitch muscles.
  • all of the above are measured by maximum oxygen intake
  • The lungs expand in size.
Increasing cardiorespiratory fitness levels is difficult for experienced athletes because __________.A.they are not motivated to increase their levels of cardiorespiratory fitnessB.they cannot commit the training time to increase their cardiorespiratory fitnessC.they have already achieved high levels of cardiorespiratory fitnessD.none of the above
  • Not A
  • The lungs expand in size.
  • VO2 max
  • 18.5 to 24.9
The cardiovascular system helps move hormones throughout the body during exercise.
  • T
  • F
  • 18.5 to 24.9
  • decline
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