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Human physiology is the scientific study of the chemistry and physics of the structures of the body and how they work together to support the functions of life. Much of the study of physiology centers on the body's tendency toward homeostasis. An understanding of physiology is not only fundamental to any career in the health professions, but it can also benefit your health. Familiarity with the human body can help you make healthful choices and prompt you to take appropriate action when signs of illness arise. Your knowledge in this field will help you understand the basics of nutrition,...

Megavoltage electron beams are an important treatment modality used in modern radiotherapy. They often provide a unique option in treatment of superficial tumors that are less than 5 cm deep. The most clinically useful electron beams have energies ranging from 6 MeV to 15 MeV. The principal applications of electrons are: (a) in the treatment of skin and lip cancers; (b) in chest wall irradiation for breast cancer; (c) in administering boost doses to nodes; and (d) in the treatment of head and neck cancers.This work focuses on the commissioning and QA of two types of treatment planning systems...