Answer :
Final answer:
Low levels of glucose or oxygen make it difficult for Guillermo to walk up steps because cells need these molecules for energy production.
Explanation:
Low levels of glucose or oxygen in cells can make it difficult for Guillermo to walk up steps because these molecules are essential for energy production in the body. Glucose is the primary source of fuel for cells, and oxygen is needed for aerobic respiration, which generates ATP (adenosine triphosphate), the molecule that provides energy for cellular processes. Without enough glucose or oxygen, the cells cannot produce enough ATP to meet the energy demands of Guillermo's muscles, leading to fatigue and difficulty in physical activities like walking up steps.
Learn more about energy production in cells here:
https://brainly.com/question/28537327
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