Question

Assertion :

Bones possess longitudinal canals called lacunae.

Reason:

Lacunae carry blood vessels and nerves to the bones.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is D Both Assertion and Reason are incorrect

Lacunae are actually the flat 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 encricle a longitudinal central canal called Haversian canal. It is the Haversian canal, which carries blood vessels and nerves to the

bone. Lacunae containing osteocytes occur in a layer between two lamellae.

So, the correct answer is 'Both Assertion and Reason are incorrect'.