Blood, another type of connective tissue, is composed of cells that are suspended in a fluid intercellular matrix called blood plasma. These cells include red blood cells, white blood cells, and cellular fragments called platelets. Red blood cells transport gases. White blood cells fight infection; and platelets are involved in blood clotting. Most blood cells form in special tissues

Animal Cell 800x


Red blood cells

Intercellular fluid (plasma)


White blood cell


Blood tissue consists of red blood cells, white blood cells, and platelets suspended in an intercellular fluid (200x micrograph enlarged to 800x).

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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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