A centriole (SEN-tree-ole) is a short cylindrical assembly of microtubules, arranged in nine groups of three micro-tubules each (fig. 3.30). Two centrioles lie perpendicular to each other within a small clear area of cytoplasm called the centrosome41 (see fig. 3.5). They play a role in cell division described in chapter 4. Each basal body of a flagellum or cilium is a single centriole oriented perpendicular to the plasma membrane. Basal bodies originate in a centriolar organizing center and migrate to the plasma membrane. Two microtubules of each triplet then elongate to form the nine pairs of peripheral microtubules of the axoneme. A cilium can grow to its full length in less than an hour.

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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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