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Assertion: The medullary cavity in long bones is filled with yellow marrow.
Reason: Yellow marrow is responsible for producing red blood cells.
Both the assertion and reason are true, and the reason is the correct explanation of the assertion.
Both the assertion and reason are true, but the reason is not the correct explanation of the assertion.
The assertion is true, but the reason is false.
The assertion is false, but the reason is true.
Answers (1)
The assertion in this question is that the medullary cavity in long bones is filled with yellow marrow. This assertion is true because the medullary cavity, also known as the bone marrow cavity, is found in the center of long bones and is filled with bone marrow. In adult long bones, the bone marrow is predominantly yellow marrow, which consists mainly of fat cells and serves as a store of energy.
The reason given is that yellow marrow is responsible for producing red blood cells. This reason is false because the red marrow, which is found in the spongy bone in the ends of long bones, is responsible for producing red blood cells, white blood cells, and platelets.
Therefore, the assertion is true, but the reason is false, making option (c) the correct answer. The presence of yellow marrow in the medullary cavity of long bones is important for energy storage, while red marrow in the spongy bone is responsible for hematopoiesis, or the production of blood cells.
Hence, option 3 is the correct answer.
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