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Exam 21: The Lymphatic and Immune Systems

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Question 31

Multiple Choice

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The immune system cell type that is preferentially destroyed by the AIDS virus is the

A) helper T lymphocyte.
B) cytotoxic T lymphocyte.
C) helper B lymphocyte.
D) B lymphocyte.

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Question 32

Multiple Choice

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In a histological cross section through an artery, a vein, and a lymphatic vessel, one can recognize the lymphatic vessel because it

A) has the thinnest walls.
B) has the thickest tunica media.
C) always lies closest to the artery, which has the thinnest walls.
D) has the fewest valves.

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Question 33

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Lymphocytes attack antigens mostly in lymphoid organs (except the thymus) and in

Two-lobed lymphoid organ located posterior to the sternum.

The lymph organ that lies in the superior part of the thoracic mediastinum is the

Lymph vessels drain lymph from all the lymphoid organs (simply because lymph vessels drain almost all organs of the body) . However, lymph vessels enter (empty into) only one type of lymphoid organ. The only organ with such afferent lymph vessels is

The paired drain lymph from the head and neck.

The right lymphatic duct drains the intestinal trunk.

The HIV that causes AIDS infects immune cells that have the surface protein called .

Explain why lymph from the right upper limb is drained into vessels on the right side of the neck, whereas lymph from the right lower limb is drained into vessels on the left side of the neck.

A lymphoid nodule is

Epithelial cells within the thymus secrete hormones that are important to lymphocyte development.

Lymph is propelled through the lymph vessels by the force of the heartbeat.

The largest kind of lymphatic vessel is a lymphatic

Which of the following is not classified as a lymphoid organ?

Figure 21.1 Use the diagram above to answer the following questions. -Identify the letter that indicates the smallest lymphatic vessel that collects lymph in the peripheral tissue.

To activate lymphocytes, bacteria must penetrate the epithelium of tonsils.

A bubo is

The immune system cell type that is preferentially destroyed by the Epstein-Barr virus in mononucleosis is the

Figure 21.1 Use the diagram above to answer the following questions. -Identify the letter that indicates where most nutrient and waste exchange occurs between the tissue and blood.