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The spleen, thymus gland, tonsils, and lymph nodes are:

Concerned only with destroying RBCs

Confined to the thoracic cavity

Lymphoid organs

Concerned only with phagocytosis

Answer and Explanation

The Correct Answer is C

A. Concerned only with destroying RBCs

Only the spleen is partly involved in RBC destruction-this doesn’t apply to all listed organs.

B. Confined to the thoracic cavity

These organs are located in different parts of the body-e.g., spleen in the abdomen, lymph nodes throughout the body.

C. Lymphoid organs

These are all components of the lymphatic/immune system, involved in immune surveillance and lymphocyte production.

D. Concerned only with phagocytosis

While some have phagocytic activity (e.g., macrophages in lymph nodes), their functions go far beyond phagocytosis (e.g., immune cell activation).

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Correct Answer is B

Explanation

A. Potassium

Potassium relates to fluid/electrolyte balance, not directly to infection.

B. WBC count

An elevated white blood cell (WBC) count indicates the body is mounting an immune response, suggesting infection.

C. BUN

BUN measures kidney function and hydration status, not infection.

D. RBC count

RBCs relate to oxygen-carrying capacity (anemia, blood loss), not infection.

A. Gives active artificial immunity B. Is a gamma globulin C. Contains antibodies D. Gives active natural immunity

Correct Answer is A

Explanation

A. Gives active artificial immunity

Vaccines stimulate the body’s immune system to produce antibodies and memory cells, creating active immunity artificially.

B. Is a gamma globulin

Gamma globulin is a preparation of antibodies used for passive immunity, not a vaccine.

C. Contains antibodies

Vaccines usually contain antigens (weakened or inactivated parts of a pathogen), not antibodies.

D. Gives active natural immunity

Active natural immunity is obtained through actual infection, not vaccination.

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The spleen, thymus gland, tonsils, and lymph nodes are:

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