multiple-choice questions\n8. stellas respiratory system is not working well. why is this a problem for her…

multiple-choice questions\n8. stellas respiratory system is not working well. why is this a problem for her ability to exercise?\na her respiratory system will not be able to break down molecules from air into oxygen.\nb her cells will not work well when they have low levels of oxygen.\nc her digestive system will have to work twice as hard to get the same amount of energy from glucose molecules.\nd her cells will not work because molecules from air will be too large for her body to use.

multiple-choice questions\n8. stellas respiratory system is not working well. why is this a problem for her ability to exercise?\na her respiratory system will not be able to break down molecules from air into oxygen.\nb her cells will not work well when they have low levels of oxygen.\nc her digestive system will have to work twice as hard to get the same amount of energy from glucose molecules.\nd her cells will not work because molecules from air will be too large for her body to use.

Answer

Brief Explanations:

The respiratory system's main function is to supply oxygen to cells. During exercise, cells need more oxygen for energy production (cellular respiration). If the respiratory system isn't working well, oxygen supply is limited. Cells rely on oxygen for efficient energy release. Low oxygen levels impair cell function during exercise.

  • Option a: The respiratory system doesn't break down molecules into oxygen. It takes in oxygen from the air.
  • Option c: The digestive system's work isn't directly related to the respiratory system's failure in this context.
  • Option d: Molecules from air (like oxygen) are not too large for the body to use. The issue is supply, not size.

Answer:

B. Her cells will not work well when they have low levels of oxygen.