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. Some attach to one kinetochore of a dyad with those growing from the opposite centrosome binding to the other kinetochore of that dyad. 2  Some bind to the arms of the chromosomes. 3  Still others continue growing from the two centrosomes until they extend between each other in a region of overlap.