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Which letter from the following image represents the white blood cell subtype that includes B and T cells?

A.

Eosinophil

B.

Basophil

C.

Monocyte

D.

Lymphocyte

Answer and Explanation

The Correct Answer is D

A. Eosinophil: Eosinophils are involved in allergic reactions and parasitic infections, but they are not responsible for B and T cell functions.

B. Basophil: Basophils are involved in inflammatory responses, particularly releasing histamine, but do not include B or T cells.

C. Monocyte: Monocytes are large white blood cells that develop into macrophages but do not include B or T cells.

D. Lymphocyte: Lymphocytes are a subtype of white blood cells that include B cells (which produce antibodies) and T cells (which are involved in cell-mediated immunity), making this the correct answer.


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Related Questions

Correct Answer is D

Explanation

A. Brachiocephalic artery: This artery supplies blood to the upper body, including the head, neck, and right arm, but not the lower limbs.

B. Splenic artery: The splenic artery supplies the spleen, and it has no direct role in supplying blood to the lower limb.

C. Common hepatic artery: This artery supplies the liver, not the lower limbs.

D. Femoral artery: This is the major artery supplying oxygenated blood to the lower limb, making it the correct answer.

Correct Answer is C

Explanation

A. Endocardium: The endocardium is the innermost layer of the heart wall, lining the chambers and valves, and is not in contact with pericardial fluid.

B. Fibrous pericardium: This is the outermost layer of the pericardium but is not part of the heart wall. It provides protection and support but does not come into direct contact with pericardial fluid.

C. Epicardium: The epicardium is the outer layer of the heart wall and is in direct contact with pericardial fluid, which is found between the epicardium and the pericardium.

D. Myocardium: The myocardium is the middle muscular layer responsible for heart contractions and is not in contact with pericardial fluid.

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