Cells: The Building Blocks of Life

The human body contains millions of cells that rely on healthy nutrition like proteins, vitamins and minerals. While the body can create some of these nutrients, it also requires essential vitamins and minerals from food sources.

Every living organism depends on its cells to function normally. Often referred to as “the building blocks of life,” cells are the biological, structural and functional units that carry out tasks in an organism. A collection of cells working together is called a tissue, while a series of tissues performing organized functions are called organs.

The human body contains trillions of cells, all with varying tasks that help support bodily organs; these include skin cells, nerve cells, blood cells, barrier function cells (supporting the lungs, gut) and more. Cells rely on good nutrition for energy production and to prevent oxidative damage.

The anatomy of a cell
Cells in the human body are so tiny that they are invisible to the naked eye–cells range in size from 1 to 100 micrometers. Even the largest type, the fertilized egg, requires the use of a microscope to see. They also have differing lifespans depending on their type and function: Some digestion-related cells can live for a few days while pancreatic cells can live up to a year.

The human body’s cells are made up of the same basic structural parts, even though they may carry out different functions all over the body. Here are the main parts of a cell:

Cell membrane: The semipermeable

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