Blood formation in the bone marrow and lymphatic organs is called, respectively, lymphoid and myeloid hemopoiesis.
True.
False.
Partially true.
Undetermined.
The Correct Answer is B
Choice A rationale
Hemopoiesis is the general term for blood cell formation. Myeloid hemopoiesis refers to the formation of red blood cells, granulocytes, monocytes, and platelets, which primarily occurs in the red bone marrow. Lymphoid hemopoiesis refers to the formation of lymphocytes, which occurs in lymphatic organs such as the lymph nodes, thymus, and spleen, but also significantly in the bone marrow for B-cell maturation and T-cell precursors. The statement incorrectly implies that lymphoid hemopoiesis occurs *only* in lymphatic organs and myeloid *only* in bone marrow, and the phrasing reverses their typical associations.
Choice B rationale
The statement is false. Hemopoiesis is indeed the formation of blood cells. Myeloid hemopoiesis, the formation of most blood cell types (erythrocytes, granulocytes, monocytes, platelets), predominantly occurs in the red bone marrow. Lymphoid hemopoiesis, the formation of lymphocytes, occurs in lymphoid tissues (lymph nodes, thymus, spleen) but also originates from stem cells in the bone marrow, with B cells maturing there and T cell precursors migrating to the thymus. The original statement incorrectly defines the primary sites and the relationship between lymphoid and myeloid hemopoiesis.
Choice C rationale
The statement contains fundamental inaccuracies regarding the primary sites of lymphoid and myeloid hemopoiesis. While there are overlaps and precursor origins in bone marrow for both lineages, the generalized and exclusive assignments made in the statement are incorrect, making it fully false rather than partially true.
Choice D rationale
The processes of lymphoid and myeloid hemopoiesis and their respective sites of formation are well-established scientific facts. There is no ambiguity or lack of information to render the statement "undetermined.”. The current understanding of hematopoiesis clearly refutes the claim. .
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
Choice A rationale
The spleen is primarily involved in filtering blood, removing old red blood cells, and housing immune cells. While it plays a role in blood storage and immune responses, it is not a primary site for the synthesis of most clotting factors, which are complex proteins.
Choice B rationale
Red bone marrow is the primary site of hematopoiesis, the production of all blood cells, including platelets, erythrocytes, and leukocytes. However, it does not synthesize most of the plasma clotting factors; rather, it produces the cellular components involved in coagulation.
Choice C rationale
Perivascular tissue surrounds blood vessels and contains various cell types, including fibroblasts and adipocytes. While these tissues can contribute to local inflammatory responses or tissue repair, they are not major sites for the systemic synthesis of plasma clotting factors.
Choice D rationale
The kidneys play a vital role in blood filtration, waste excretion, and regulation of blood pressure and erythropoiesis (via erythropoietin). However, the kidneys do not synthesize the majority of the plasma clotting factors required for hemostasis.
Choice E rationale
The liver is the primary site for the synthesis of most plasma clotting factors, including fibrinogen, prothrombin, and factors V, VII, IX, X, and others. Hepatocytes in the liver are responsible for the complex protein synthesis required for the coagulation cascade, making it critical for hemostasis.
Correct Answer is C
Explanation
Choice A rationale
The visceral layer of the serous pericardium, also known as the epicardium, directly covers the myocardium. Pericardial fluid is not found between these two layers, as they are essentially continuous. The fluid reduces friction between the moving surfaces.
Choice B rationale
The visceral layer of the serous pericardium is the epicardium. Therefore, stating that pericardial fluid is found between the visceral layer and the epicardium is redundant and incorrect, as they represent the same anatomical structure. Pericardial fluid facilitates frictionless movement.
Choice C rationale
Pericardial fluid is a serous fluid found within the pericardial cavity. This cavity is a potential space situated between the parietal layer of the serous pericardium, which lines the fibrous pericardium, and the visceral layer of the serous pericardium (epicardium), which adheres to the heart's surface. This fluid lubricates the heart, allowing it to beat without friction.
Choice D rationale
The myocardium is the muscular layer of the heart wall, and the endocardium is the innermost layer lining the heart chambers. There is no fluid-filled space between the myocardium and endocardium; these layers are contiguous components of the heart wall.
Choice E rationale
The epicardium is the visceral layer of the serous pericardium, and the myocardium is the muscular wall of the heart. These two layers are directly adjacent, with the epicardium forming the outer covering of the myocardium. Pericardial fluid is external to the epicardium.
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