Concentric contractions: A concentric contraction is a type of muscle contraction where the length of the muscles shorten while undergoing tension. For example, when you pick up a curl bar and perform a biceps curl, the length of your biceps muscles shorten.
Causes of Blood in Stool. 1  Anal Fissure. If no diarrhea, most of these children have a small tear in the anus. 2  Strep Skin Infection. A Strep skin infection around the anus can also cause blood-streaked stools. 3  Bacterial Diarrhea. If also has bloody diarrhea, a gut bacterial infection may be the cause.  Red, but not Blood.
This tends to cause blood in the babyâs stool and the main reason is attributed to genetic trends. The immune system of a baby is not developed and this makes them susceptible to infections. It is observed that bacteria evade over the intestinal wall and degeneration of it may cause spike of blood in the stool of infants. Treatment