How a 3-carbon molecule, along with some

How does your body convert food energy into usable cellular energy? How many steps are involved in this process? This lesson answers those questions through an exploration of the Krebs cycle. Illustrations are included to guide your understanding.

What is Cellular Respiration?

As you sit and read these words your eye muscles are contracting, thus allowing you to scan this page. Your lungs are expanding and contracting, your heart is beating, and your hand muscles are flexing each time you move the computer mouse. Where does your body get the energy for performing these movements? In part, it comes from the food you eat.

But, more specifically, it comes from cellular respiration. Cellular respiration is the process your body uses to convert the chemical energy from food into usable cellular energy. Our first illustration depicts the overall process of cellular respiration.

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Steps in Cellular Respiration
Krebs Cycle (blue dots indicate number of carbon molecules)
End of the Krebs Cycle
How simpler molecule called pyruvate. Glucose is a
  • Cells converted into ATP, and so the
  • This that are used within the cellular
  • Cellular to it. ”tri-” is from the
  • In that it uses cellular respiration to
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