J

Red bone marrow

Undifferentiated lymphocytes

Blood transport

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Undifferentiated lymphocytes

Blood transport

(3) Some undifferentiated lymphocytes are processed, probably within the bone marrow, to become B cells.

Figure 16.16

Bone marrow releases undifferentiated lymphocytes, which after processing become T cells (T lymphocytes) or B cells (B lymphocytes). Note that in the fetus the medullary cavity contains red marrow.

an organ in the chicken where these cells were first identified.) The blood distributes B cells, which constitute 20% to 30% of circulating lymphocytes. B cells settle in lymphatic organs along with T cells and are abundant in lymph nodes, the spleen, bone marrow, and intestinal lining (figs. 16.16 and 16.17).

O What is immunity?

^9 What is the difference between an antigen and a hapten?

^9 How do T cells and B cells originate?

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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