Introduction

Examples of other cellular organelles are mitochondria (which create ATP from glucose), chloroplasts (which are used to make energy through photosynthesis), the cytoskeleton (which is made out of protein filaments and help with cell movement), and the endomembrane system (which is responsible for the manufacture and transport of different substances both within and out of the cell).

Read these sections to review the endomembrane system and the cytoskeleton and to introduce the different types of physical connections that exist between adjacent cells and allow for cell-to-cell communication. Keep in mind that, much like the human body works as a whole, with each organ contributing to its homeostasis, each cell functions as a whole, with each organelle contributing a function or set of functions to maintain cellular homeostasis.