It is easy and. inexpensive to test for coliform bacteria. If testing detects coliform bacteria in a water sample, water systems search for the source of contamination and restore safe drinking water.
The osteon, or Haversian system, is the fundamental functional unit of much compact bone. Osteons, roughly cylindrical structures that are typically several millimeters long and around 0.2 mm in diameter. Each osteon consists of concentric layers, or lamellae, of compact bone tissue that surround a central canal, the Haversian canal. The Haversian canal contains the boneâs nerve and blood supplies. Osteoblasts form the lamellae sequentially, from the most external inward toward the Haversian canal.
What tiny canal connects central canals to lacunae in compact bone? What are small cavities in bone tissue where osteocytes are found? The small spaces in compact bone tissue that are holes that  osteocytes live in are called lacunae (singular: lacuna). The canal  that runs through the core of each osteon iâ¦s the site of blood  vessels and nerve fibers; these canals are called canaliculi.    The lacuna can sometimes be seen as an empty space with the cell  nucleus inside and sometimes the cell nucleus takes up the entire  lacuna.