What is protoplasm?

Protoplasm refers to the living substance of a cell, which includes both the cytoplasm and the nucleoplasm. It is essentially the jelly-like material that makes up the physical structure of cells and houses various organelles, enzymes, and other components vital for the cell's functions. Understanding protoplasm is crucial in esthetics as it plays a significant role in cellular activities, including metabolism, growth, and repair of the skin.

In contrast, the other options do not accurately define protoplasm. While the liquid part of blood and substances found in minerals may be related to biological processes, they do not encompass the essence of cellular composition. Additionally, cellular waste refers to byproducts generated from metabolic processes, further distinguishing it from the fundamental structure that allows cells to function and thrive.