Chapter 21.3, Problem 10AYLO

Summary Introduction

To discuss:

The life history of T cells, including their origin, migration to the thymus, the sites, processes, and purposes of positive and negative selection, and dispersal of the native lymphocyte pool.

Introduction:

For all living organisms, it is a challenge to defeat the entire pathogenic organism, for survival. The human body kills the pathogen or eliminates the foreign particles by an organized system called the lymphatic system. The lymphatic system or immune system consists of a group of cells or immune cells which inhabit all the organs of the body. The lymphatic system includes lymphatic organs and a group of lymphatic tissues that are involved in the immune system.