This edition: Basic Chemistry & the Cellular Level of Organization
During the initial stages of life, one male cell and one female cell combine and set the stage for cell division. Cells continue to divide and differentiate and cause us to grow—our bones get longer and our muscles and organs get bigger. Because our tissues are made of cells, and our organs made of tissues, more cells must be created in order for us to develop and grow. Through a delicate balance of chemistry and cell division, a mature human being develops and is ultimately comprised of about 75 trillion cells. In this lesson, you’ll learn about how atoms play a part in the chemistry that makes life possible and the ways that cells function and divide.