The term "human cells" refers to the basic structural and functional units of living organisms, specifically in humans. These are small membrane-bound sacs that contain genetic material (DNA) and carry out all the essential functions for life such as growth, reproduction, respiration, and metabolism.
In a broader sense, human cells can also refer to any of the various specialized cell types that make up tissues and organs in the body. These include neurons (in the brain and nervous system), muscle cells (in skeletal and cardiac muscles), red blood cells (in the circulatory system) among others, each with their unique structure and function.
Overall, human cells are the building blocks of life and play a critical role in maintaining homeostasis, growth, development, and repair processes within the body.