Haversian systems or osteons
A) are found in spongy bone tissue.
B) lack concentric lamellae.
C) are the basic units in compact bone tissue.
D) do not contain osteocytes.
E) are avascular.

Question

Quizplus · Accepted Answer

Haversian systems, also known as osteons, are the basic units in compact bone tissue, consisting of concentric lamellae around a central Haversian canal that contains blood vessels and nerves. Spongy bone tissue does not contain Haversian systems, making option A incorrect. Lamellae are a defining feature of Haversian systems, so they are not lacking, making option B incorrect. Osteocytes, which are bone cells responsible for maintaining bone tissue, are found in lacunae (small spaces) between the lamellae of Haversian systems, making option D incorrect. The central Haversian canal containing blood vessels and nerves also means that Haversian systems are not avascular, making option E incorrect.

Haversian Systems or Osteons