if broken down glucose and oxygen are entering and ATP, water, and Carbon Dioxide are exiting, and based on the shape and internal walls, I would say that that is the Mitochondria.
The illustration represents the mitochondria of the cells.
Explanation:
The image shows the structure of a mitochondrion, whose shape is "ovoid", which contains two membranes, a folded inner and a smooth outer, observing invaginations (mitochondrial ridges). This article contains the enzymes for the Krebs cycle, oxidative phosphorylation being responsible for the energy generator for the maintenance of cellular activity.
