HUMAN ANATOMY-ACCESS
HUMAN ANATOMY-ACCESS
9th Edition
ISBN: 9780134562773
Author: Martini
Publisher: PEARSON
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Chapter 23, Problem 1RC
Summary Introduction

Introduction:

The thymus is one of the lymphatic organs that produces T (thymus-dependent) cells. It is known as the primary lymphatic organ, wherein the lymphocytes are made and become matured. It comprises the reticular cells, thymic corpuscles, and developing T cells. It releases thymosin, a hormone that is involved in the development of the T cells.

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T cells and B cells can be activated only by, (a) pathogenic microorganisms.(b) interleukins, interferons, and colony-stimulating factors. (c) cells infected with viruses, bacterial cells, or cancer cells. (d) exposure to a specific antigen bound to a MHC protein on a plasma membrane.
Lymphocytes responsible for providing cell-mediated immunity are called(a) macrophages. (b) B cells. (c) plasma cells. (d) cytotoxic T cells.
Which of the following is NOT true about T cells?(a) T cells develop from lymphoid stem cells in the bonemarrow and mature in the thymus.(b) Cell-mediated immunity is primarily carried out by Tcells.(c) Subsequent differentiation of T cells produces cytotoxic(killer) T cells, delayed-hypersensitivity T cells, helper Tcells, and regulatory T cells.(d) Natural killer cells (NK) are exclusively differentiated Tcells.(e) T cells act in situations where antigens are embeddedin cell membranes or are inside host cells and thus areinaccessible to antibodies.
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