Histological characteristics of the mononuclear ph

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Lymphatic System and Immunity Test Questions Questions

Question 1 of 5

Histological characteristics of the mononuclear phagocytic cells include which of the following:

A. They have irregular surfaces with many pseudopodia B. They have well developed Golgi complex and prominent sER C. They have many peroxisomes D. They have central rounded nucleus

Correct Answer: A

Rationale: Mononuclear phagocytes (macrophages) have irregular surfaces with pseudopodia for phagocytosis ; Golgi and sER are present but not defining , peroxisomes are not notable , nuclei vary .

Question 2 of 5

What are the two types of TCRs?

A. Alpha and beta B. AB and CD C. YD and CD D.

Correct Answer: A

Rationale: TCRs are alpha-beta or gamma-delta; AB/CD/YD/CD are not standard notations.

Question 3 of 5

What is the purpose of central tolerance induction in the thymus?

A. To train T cells to attack foreign cells only B. To train T cells to recognize self MHC molecules and not attack our own body cells C. To train T cells to recognize self MHC molecules and attack our own body cells D. To train B cells to produce antibodies against foreign antigens

Correct Answer: B

Rationale: Central tolerance ensures T cells recognize self-MHC without attacking self ; not just foreign , not attack self , not B cells .

Question 4 of 5

How are B cells activated?

A. A B cell is activated when it encounters an antigen that matches its B cell receptors and receives cytokines from helper T cells B. B cells are activated when they encounter their twin T cell component C. B cells are activated when red blood cells release cytokines D. B cells are activated when their matching antibodies attach to their surfaces and macrophages release cytokines

Correct Answer: A

Rationale: B cells need antigen binding to BCRs and T-helper cytokines ; no twin T cells , RBCs , or antibody-macrophage mechanism activate them.

Question 5 of 5

Lymph nodes function as meeting points between antigen-bearing dendritic cells arriving from the tissue and recirculating B and T lymphocytes. Whereas the dendritic cells coming from the tissue enter the lymph node via the afferent lymphatic vessels, the recirculating lymphocytes enter the lymph node:

A. Also from the lymph fluid draining the tissue B. Directly from their primary lymphoid organ where they develop C. From the blood by crossing the high endothelial venules D. By being trapped in the lymphoid follicle by resident macrophages

Correct Answer: C

Rationale: Lymphocytes enter lymph nodes via blood through high endothelial venules ; not lymph , primary organs , or trapping .

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Histological characteristics of the mononuclear phagocytic cells include which of the following:

Nurselytic

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