After all, a nail is sharp, and the inside of the nose is sensitive. Putting a foreign object deep into your nasal cavity isn't particularly comfortable, and it can be certainly painful when the performer is learning to do the trick. However, another obstacle -- sneezing -- can be harder to overcome.
Osteoclasts are the bone cell that destroys bone. This allows bone  remodeling, and allows the skeletal system to act as a reservoir  for minerals to maintain blood mineral â¦ levels. Bone cells that are involved in reabsorption and breakdown of the  bone matrix are referred to as osteoclasts.
Posted September 29, 2005. At this very second, cells in your body are replacing themselves. Maybe your muscle cells, maybe your bone cells, or maybe even both. First, how do they do it? All cells replace themselves by dividing, but the results of this division vary in different kinds of cells. Some cells, such as those of the liver, divide in two to create two liver cells which are just like the parent that divided to produce them. In other cases, special cells called stem cells divide to replace other cells.