When sugar (specifically carbohydrates like glucose) is digested in an animal cell, the primary product is ATP (adenosine triphosphate). Here's how it works:

* Glycolysis: The first step of sugar digestion occurs in the cytoplasm. Glucose is broken down into pyruvate, producing a small amount of ATP and NADH (a molecule that carries electrons).

* Krebs Cycle (Citric Acid Cycle): Pyruvate enters the mitochondria and is further broken down, generating more NADH, FADH2 (another electron carrier), and a small amount of ATP.

* Electron Transport Chain: The NADH and FADH2 molecules from the previous steps deliver their electrons to the electron transport chain within the mitochondria. This process drives the production of a large amount of ATP through oxidative phosphorylation.

So, the main product of sugar digestion in an animal cell is ATP, the cell's primary energy currency.

Other products include:

* Water: Water is produced as a byproduct of ATP production.

* Carbon Dioxide: Carbon dioxide is released as a waste product of the Krebs cycle.

Let me know if you have any more questions!