Question

1. which of the following statements is supported by evidence from the model in figure 1, and may help to explain why the marathoner collapsed. when there is not enough food available to the cells, the body stops performing cellular respiration altogether, and the organs and muscles shut down when there is not enough food available to the cells, the body relies solely on breaking down water molecules to release energy, which is not sufficient to sustain activity. when there is not enough oxygen available to the cells and tissues, the body uses a process other than cellular respiration to release energy, which results in the formation of different products. when there is not enough oxygen available to the cells, the body converts all stored energy directly into heat, which causes fever and eventually collapse.

Explanation:

Cellular respiration requires oxygen. When oxygen is scarce, the body undergoes anaerobic respiration (a process other than aerobic cellular respiration). Anaerobic respiration produces different products (e.g., lactic acid in humans) compared to aerobic cellular respiration.
The first option is incorrect because the body doesn't stop cellular respiration altogether when food is scarce (it can use stored glycogen etc.). The second option is wrong as water molecules are not broken down for energy in this context. The fourth option is incorrect as the body doesn't convert all stored energy directly into heat when oxygen is scarce.

Answer:

When there is not enough oxygen available to the cells and tissues, the body uses a process other than cellular respiration to release energy, which results in the formation of different products.