Q. 1 - Biology

Question

Which of the following statements about bone tissue is false?

1. Compact bone tissue is made of cylindrical osteons that are aligned such that they travel the length of the bone. 
2. Haversian canals contain blood vessels only. 
3. Haversian canals contain blood vessels and nerve fibers. 
4. Spongy tissue is found on the interior of the bone, and compact bone tissue is found on the exterior.

Step-by-Step Solution

Answer

The Correct answer is option (b).

Haversian canals contain blood vessels only. 

Step: 1 Bone contained in Haversian canals

• The Haversian canals, which connect with osteocytes, envelop blood vessels and nerve fibres in the bone.
• The central canal known as a Haversian canal is part of the Haversian system, a network of canals found inside the compact bone.
• The Haversian canals that form in the center of the compact bone can contain lymphatic vessels, blood arteries, connective tissues, nerve fibres, and soft tissue.

Step: 2 Explanation for Correct answer

• The Haversian canals, which connect osteocytes to the bone's blood vessels and nerve fibres, surround these structures.  

• In Haversian, the bone's blood vessels and nerve fibres are located in canals. Thus, the option b is correct.

Step: 3 Explanation for incorrect answer

• Compact bone tissue contains osteons that are aligned along stress lines in the same direction, therefore helps the bone avoid bending or splitting. So, option a is wrong.
• The Haversian canals, which connect osteocytes to the bone's blood vessels and nerve fibres, envelop these structures. So, option c is wrong as well.
• The ends of long bones are composed of spongy bone, while the outer layers of bones are composed of compact bone tissue. Hence, option d is wrong too.