I. Molecules are formed by linking atoms together.
II. A covalent bond is formed when two atoms share a pair of electrons. Each type of atom can form a characteristic number of covalent bonds: hydrogen forms one; oxygen, two; nitrogen, three; and carbon, four.
III. Molecules have characteristic shapes, which can be altered within limits by the rotation of their atoms around covalent bonds.
Vander et al.: Human Physiology: The Mechanism of Body Function, Eighth Edition
PART ONE Basic Cell Functions
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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.