a. Heredity. With respect to both anatomy and physiology, offspring tend to resemble their parents. This is due to the process known as heredity or inheritance. Heredity depends upon the passage of materials called genes from one generation to the next. Due to genes, all human beings resemble each other in general, but with individual differences.
b. Genetic Control. The genes control the life processes of each body cell. In an individual, each cell has identical genes. Overall, genes determine the range of potentiality of an individual, and the environment develops it. For example, good nutrition will help a person to attain his full body height and weight within the limits determined by his genes.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.