When you are hungry, how do you feel? If you are like most people, you feel sluggish, a little dizzy, and – above all - weak. Weakness is a feeling triggered by a lack of energy. You feel weak when you are hungry because food serves as a source of energy. Weakness is your body's way of telling you that your energy supplies are low. But how does food get converted into a usable form of energy? The answer is cellular respiration!

Directions: Watch the following video for a quick overview of the process of respiration.

Let's review what you have learned! Drag each term to the correct space below: