C

Figure

(a) Ionizing radiation may dislodge an electron from an electrically neutral hydrogen atom. (b) Without its electron, the hydrogen atom becomes a positively charged hydrogen ion (H+).

E^yllB Sources of Ionizing

IsMl! Radiation

Background (Natural environmental)

Cosmic rays from space Radioactive elements in earth's crust Rocks and clay in building materials

Radioactive elements naturally in the body (potassium-40, carbon-14)

Radioactive substances

Other

Atomic and nuclear weapons Mining and processing radioactive minerals Radioactive fuels in nuclear power plants Radioactive elements in consumer products (luminescent dials, smoke detectors, color TV components)

Essentials of Human Physiology

Essentials of Human Physiology

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.

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