Practice problem
Maintain Internal Environment — Characteristics of Life
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The cells of your body are constantly bombarded with bacteria, viruses, proteins, ions, nutrients, water, and many other substances. Some of these substances are helpful and some can cause harm to the cell.
Thus, it is crucial for each to maintain homeostasis by regulating what can enter and leave.
The image below shows a simplified diagram of an animal cell. Several parts are labeled. Use this diagram to help you answer the question that follows.
Image source: By domdomegg (Own work) CC BY 4.0, via [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Simple_diagram_of_animal_cell_(en.svg)
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Which of the cell structures labeled in the diagram above likely has the greatest role in helping the cell maintain homeostasis?