Human Physiology

Human physiology is the science of the functioning of organs and cells that compose them. It studies the mechanical, physical, and biochemical functions that determines the health of a person. Physiology studies function.�It is broken into four levels of increasing physiological complexity. The most basic level is the molecular level, which includes all chemical substances that are necessary for cells to function. At the tissue level, study expands to examine function of the basic types of tissue, including epithelial, muscle, nervous, and connective tissues. The third level of study is the organ level. An organ consists of two or more tissues that perform a certain function. Typical organs studied include heart, liver, lungs, and stomach. The fourth level of study is the system level, which studies the functions of the major systems of the human body: Digestive, Nervous, Endocrine, Circulatory, Respiratory, Urinary and Reproductive.�Many occupations incorporate human physiology. This includes fitness trainers who work in spas, gyms and direct health and fitness programs. Biological scientists study living organisms and their relationship with the environment. Physical therapists provide treatment and recreation for individuals with disabilities.

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