InterviewSolution
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InterviewSolution
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Assertion : Bones possess longitudinal canals called lacunae. Reason : Lacunae carry blood vessels & nerves to the bones.A. If both the assertion and the reason are true and the reason is a correct explanation of the assertionB. If both the assertion and reason are true but the reason is not a correct explanation of the assertionC. If the assertion and reason are falseD. If the assertion is false but reason is true |
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Answer» Correct Answer - D Lacunae are actually the falt irregular spaces occurring in the solid matrix of bone. Each lacuna lodges a flat bone cell or osteocyte. Compact bone possesses many parallel, longitudinal column like structures called haversian systems in which several concentric layers of bony matrix called lamellae encircle a longitudinal centeral canal called haversian canal. It is the Haversian canal which carries blood vessels and nerves to the bone. Lacunae containing osteocytes occure in a layer betweet two lamellae. |
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