Structural Organisation In Animals Question 139
Assertion : Bones possess longitudinal canals called canaliculi. Reason : Lacunae carry blood vessels & nerves to the bones.
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
Show Answer
Answer:
Correct Answer: D
Solution:
Lacunae are the flat irregular spaces occurring in the solid matrix of bone.
Each lacuna lodges an 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 central canal called the haversian canal.
It is the Haversian canal, which carries blood vessels and nerves to the osteocytes.
Lacunae containing osteocytes occur in a layer between two lamellae.
BETA
