Question

1. in terms of cellular respiration, why do you feel tired if you dont eat for an entire school day?

Explanation:

Cellular respiration uses glucose (from food) to produce ATP (energy). Without eating, glucose levels drop. Less glucose means less ATP via cellular respiration. Low ATP leads to fatigue as cells lack energy for functions.

Answer:

You feel tired because without eating, there is less glucose for cellular respiration to produce ATP (energy - currency of cells). With low ATP, cells (including muscle and nerve cells) lack energy for normal functioning, causing fatigue.