Question

1. jamal ate a meal of rice before seeing his doctor. rice is made of mostly starch molecules. jamal has been feeling tired a lot, so his doctor gave him a test that found that jamal’s cells contained normal levels of oxygen and low levels of glucose. does this explain why jamal has been feeling tired?

yes, jamal’s respiratory system is working, but his digestive system is not turning the oxygen into glucose.
yes, jamal’s respiratory system is working, but his digestive system is not breaking down starch molecules into glucose for his cells.
yes, jamal’s digestive system is working, but his respiratory system has too much oxygen, so his body stopped making energy
no, something else must be wrong with jamal because his cells have all the molecules they need.

Explanation:

To determine the answer, we analyze the roles of the respiratory and digestive systems. The respiratory system supplies oxygen, and the digestive system breaks down starch (from rice) into glucose. Jamal's cells have normal oxygen (so respiratory system works) but low glucose. Starch from rice should be broken down into glucose by the digestive system for cells to use in respiration for energy.

• The first option is wrong because the respiratory system doesn't turn oxygen into glucose.
• The third option is wrong as normal oxygen levels don't mean too much oxygen, and the body needs glucose and oxygen for energy.
• The fourth option is wrong because low glucose means cells don't have all molecules needed for energy (glucose is needed for cellular respiration).
• The second option is correct: respiratory system (normal oxygen) works, but digestive system isn't breaking starch into glucose, leading to low glucose and tiredness (as cells can't get enough glucose for energy).

Answer:

B. Yes, Jamal’s respiratory system is working, but his digestive system is not breaking down starch molecules into glucose for his cells.