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Where in the body are hemopoietic stem cells found?

A.

Spleen

B.

Red bone marrow

C.

Yellow bone marrow

D.

Thymus

E.

Liver

Answer and Explanation

The Correct Answer is B

A. Spleen: the spleen filters blood and can perform extramedullary hematopoiesis in disease, but it is not the primary site of hematopoietic stem cells in healthy adults.
B. Red bone marrow: in adults, hematopoietic (hemopoietic) stem cells reside mainly in red bone marrow, where all blood cell lineages are produced.
C. Yellow bone marrow: yellow marrow is mostly adipose tissue; it can convert to red marrow under stress, but it is not the principal site of HSCs in normal adults.
D. Thymus: the thymus is the site for T-lymphocyte maturation, not the main reservoir of hematopoietic stem cells.
E. Liver: the fetal liver is a major hematopoietic site, but in healthy adults the liver is not the primary location for hemopoietic stem cells (except during pathological extramedullary hematopoiesis).


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Related Questions

Correct Answer is C

Explanation

A. A positive feedback loop: Positive feedback amplifies a response (e.g., oxytocin in labor); oxygen regulation requires balance, not amplification.
B. An enzymatic amplification: This refers to intracellular signaling cascades, not whole-body oxygen regulation.
C. A negative feedback loop: Hypoxemia stimulates chemoreceptors → increases respiratory drive → raises oxygen levels. Once oxygen is restored, stimulation decreases, demonstrating a classic negative feedback loop.
D. A self-amplifying mechanism: This is another way of describing positive feedback, which does not apply to oxygen regulation.
E. A cascade effect: Cascade effects occur in clotting or enzyme cascades, not in oxygen regulation.

Correct Answer is {"dropdown-group-1":"E"}

Explanation

A. No: no A/B antigens describes type O blood, not AB.
B. Anti-A and anti-B: those are antibodies found in the plasma of type O individuals; they are not RBC antigens and are not present in type AB plasma.
C. Anti-A: anti-A are plasma antibodies found in type B blood; the question asks about RBC antigens, not antibodies.
D. Anti-B: anti-B are plasma antibodies found in type A blood; again, not RBC antigens.
E. A and B: type AB individuals have both A and B antigens on their RBC surfaces (and typically have no anti-A or anti-B antibodies in their plasma).

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