Chapter 8
Blood

FIGURE 8.1: Blood Cells. A single drop of blood contains millions of red blood cells, white blood cells, and platelets. One of each type is shown here (from left to right) isolated from a scanning electron micrograph.

The human body needs blood to deliver nutrients to and remove wastes from our trillions of cells. The heart pumps blood throughout the body in a network of blood vessels. Together, these three components, blood, heart, and vessels makes up the cardiovascular system. This chapter focuses on the medium of transport: blood.

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