Blood consists of cellular elements (red blood cells, white blood cells, and platelets) as well as plasma, the fluid in which the blood cells are suspended. Normally, total circulating blood volume is about 8% of body weight (about 5 l in women and 5.5 l in men). Adipose tissue is relatively avascular and therefore contains little blood compared to other tissues.

The cellular elements of the blood have a short life span and must be continuously replaced. The formation of red blood cells, white blood cells, and platelets, collectively, is referred to as hematopoiesis. This process takes place in the red bone marrow. In adults, red bone marrow is found in the pelvis, ribs, and sternum.

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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