Muscle contractions then push the stool toward the rectum, and, by the time the stool reaches the rectum, most of the water has been absorbed, making the stool solid. When the colon's muscle contractions are slow or sluggish, the stool moves through the colon too slowly, resulting in too much water being absorbed.
The microparticulate allograft is a mixture of mineralized cortical bone particles of a standard combination of sizes between 100 and than 250 microns. This provides an optimal scaffold for delivering osteoinductive growth factors. This preparation has an appropriate 3-dimensional (3-D) structure
Centrioles are built from a cylindrical array of 9 microtubules, each of which has attached to it 2 partial microtubules. The photo (courtesy of E. deHarven) is an electron micrograph showing a cross section of a centriole with its array of nine triplets of microtubules. It is duplicated during S phase of the cell cycle. 2  Just before mitosis, the two centrosomes move apart until they are on opposite sides of the nucleus. 3  As mitosis proceeds, microtubules grow out from each centrosome with their plus ends growing toward the metaphase plate.