Immune System Functions and Organs Quiz

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Which organ is responsible for T-lymphocyte proliferation and differentiation?

Spleen

Lymph nodes

Bone marrow

Thymus (correct)

What are the primary lymphoid organs?

Tonsils and Peyer patches

Lymph nodes and spleen

Bone marrow and thymus (correct)

Solitary nodules and MALT

What are the functions of lymph nodes?

Specific filtration by macrophages

Circulation of B and T cells

Activation of immune response

All of the above (correct)

Which organs are considered primary lymphoid organs?

Lymph nodes Signup and view all the answers

What is the main function of lymph nodes?

Filtration by macrophages Signup and view all the answers

Where are T-cells produced?

Bone marrow Signup and view all the answers

What is the function of the thymus?

T-cell maturation Signup and view all the answers

Which cells are involved in humoral immunity?

B-cells Signup and view all the answers

Which cells are involved in cell-mediated immunity?

T-cells Signup and view all the answers

Which cells are considered antigen-presenting cells (APCs)?

Dendritic cells Signup and view all the answers

What is required for T-cell receptor (TCR) recognition of antigens?

Antigen presentation by MHC molecules Signup and view all the answers

Which of the following is the main purpose of the Blood-Thymus Barrier?

To prevent immature T cells from contacting foreign antigens Signup and view all the answers

What happens to immature T cells if they come into contact with foreign antigens during development in the thymus?

They undergo apoptosis Signup and view all the answers

Why is it important for immature T cells to be protected from random antigens during development in the thymus?

Contact with random antigens can cause the death of T cells Signup and view all the answers

Which organ is responsible for filtering blood and removing damaged blood cells and pathogens?

Spleen Signup and view all the answers

Which organ is involved in T cell maturation and has a cortex rich in developing thymocytes and a medulla containing mature T cells?

Thymus Signup and view all the answers

Which organ is responsible for monitoring intestinal antigens and is located in the small intestine?

Peyer's Patches Signup and view all the answers

Which organ is responsible for guarding against inhaled and ingested pathogens and is located in the throat region?

Tonsils Signup and view all the answers

Which anatomical structure in the thymus contains mature T cells and specialized thymic epithelial cells called medullary epithelial cells?

Medulla Signup and view all the answers

Which cells form a network in the thymus that supports developing thymocytes and helps create a microenvironment for T cell maturation and selection?

Epithelial Reticular Cells Signup and view all the answers

Which type of cells are produced in the bone marrow, including immune cells like B cells and some T cell precursors?

B Cells Signup and view all the answers

Which anatomical structure in the thymus is involved in regulatory processes and is composed of concentrically arranged epithelial cells?

Hassall's Corpuscles Signup and view all the answers

Which organ is responsible for filtering lymph and facilitating immune cell interactions, and is found along lymphatic vessels?

Lymph Nodes Signup and view all the answers

Which anatomical structure in the thymus contains densely packed developing thymocytes and supports T cell maturation and selection?

Cortex Signup and view all the answers

Which cells are found in the red pulp of the spleen?

Macrophages, lymphocytes, and reticular cells Signup and view all the answers

What is the main function of Peyer's patches?

To monitor and respond to antigens entering the gut Signup and view all the answers

Which cells are responsible for antibody production and humoral immune responses?

B cells Signup and view all the answers

Which area of the lymph node is involved in immune responses and contains high endothelial venules (HEVs)?

Paracortex Signup and view all the answers

What is the function of the Blood-Thymus Barrier?

To prevent direct contact between circulating antigens and developing T cells Signup and view all the answers

Which cells are involved in cellular immune responses and directly attack infected cells?

T cells Signup and view all the answers

Where are lymphatic nodules found?

Scattered in various mucous membranes and lymphoid tissues Signup and view all the answers

What is the main function of the white pulp in the spleen?

To monitor blood for antigens and initiate immune responses Signup and view all the answers

Which cells capture, process, and present antigens to initiate immune responses?