O

Amino acid

Alanine

Cysteine

Histidine

Phenylalanine

Amino acid

Alanine

Cysteine

Histidine

Phenylalanine

Figure 2.16

(a) The general structure of an amino acid. Note the amino group (pink) and carboxyl group (blue) that are common to all amino acid molecules. (b) Some representative amino acids and their structural formulas. Each amino acid molecule has a particular shape. Also note the different R groups.

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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