Human Anatomy & Physiology (9th Edition)

Published by Pearson
ISBN 10: 0321743261
ISBN 13: 978-0-32174-326-8

Chapter 20 - The Lymphatic System and Lymphoid Organs and Tissues - Review Questions - Critical Thinking and Clinical Application Questions - Page 763: 3


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Functions of the Tonsils - the Tonsils are present at the beginnings of the Digestive & Respiratory tracts to guard against infections. - the form antibodies against infective agents ( immunological role ). so every effort is done to preserve them. Functions of the Spleen 1- in adults certain blood cells can be formed in the spleen in case of haemolytic anaemias . 2- in adults, it can concentrate & store the blood cells & blood platelets. 3- After hemorrhage, the spleen contracts to pour concentrated blood cells into the circulation. 4- the macrophages in the splenic tissue can filter the blood from bacteria or any foreign bodies. 5- the macrophages of the spleen can also remove & phagocytose the old or the destructed red blood corpuscles. 6- the macrophages of the spleen can store iron. 7- the spleen has a great immunological humoral functions : - the B-Lymphocytes of the white pulp of the spleen, , under the influence of antigenic stimulation &with the aid of T-Lymphocytes ( helper cells ) & other cells of the spleen , these B-lymphocytes become activated to form Plasmablasts. these plasmablast cells migrate to the red pulps to be changed into plasma cells. these plasma cells can produce specific antibodies directly into the circulating blood ( humoral ). therefore, the spleen can be considered as the chief source of humoral antibodies. so, every effort is done to perserve the spleen.
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