Tcells receptors TCR and Bcell receptors surface i

ATI RN

ATI RN Test Bank

T-cells receptors (TCR) and B-cell receptors (surface immunoglobulin) are similar as they:

A. Acquire specificity through gene rearrangements B. Are heterodimers C. Have many receptors of only one antigenic specificity D. all the above

Correct Answer: D

Rationale: All (A-C) are true: TCR/BCR rearrange genes , are heterodimers , specific , and have V/C regions ; thus, D.

The spleen's red pulp is primarily involved in:

A. Filtering lymph B. Destroying old red blood cells C. Producing lymphocytes D. Storing lymph

Correct Answer: B

Rationale: Red pulp destroys old RBCs; lymph filtering is lymph nodes, lymphocytes are in white pulp, and lymph storage is not a spleen function.

The thymus is located in which body cavity?

A. Abdominal B. Thoracic C. Pelvic D. Cranial

Correct Answer: B

Rationale: The thymus is in the thoracic cavity; abdominal has spleen, pelvic has bladder, cranial has brain.

The lymphatic system interacts with the circulatory system at:

A. The heart B. The subclavian veins C. The aorta D. The capillaries

Correct Answer: B

Rationale: Lymph enters blood at subclavian veins ; not heart , aorta , or capillaries directly.

The spleen's arterial supply is from which vessel?

A. Celiac trunk B. Renal artery C. Hepatic artery D. Splenic artery

Correct Answer: D

Rationale: The splenic artery supplies the spleen; celiac trunk branches to it, renal and hepatic are separate.

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