Question

ILL FAN AND GIVE A MEDAL
why must glucose be broken down in glycolysis/cell respiration?

Answer 1

the simple answer is: because your body needs energy, that's why.

now, why must it be something like glucose? all animals are heterotrophic organisms. this means that we need to take in high-energy chemicals and poo out low-energy chemicals. the difference in energy levels is what keeps us running.
imagine a water tread: water on top has more energy than the water on the bottom. the wheel runs because of that difference in energy.

glucose now has much energy stored in its chemical bonds. ever tried to light a cube of sugar on fire? it burns on its own! the burning releases the energy that is stored inside the chemical bonds and produces heat (fire is hot after all).
the process that happens in our body, called glycolysis, is simply put just a 'very slow burning' of sugar. same is true for fat and proteins, by the way.

Answer 2

did you understand? do you have any more questions?

Answer 3

Sorry I'm experiencing some technical difficulties.
Yes, I do. Thank you @Schleifspur I appreciate the help
And @new-new-new-pro55 I'm beautifully complex. And sorry, I don't understand half of your sentence. I'm not adapt to slang. I hope I answered your question though.