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.
Blood in Baby's Stool. Babies can sometimes have blood in their stool that is caused by food allergies, a small anal tear or fissure, or even a temporary case of lactose intolerance. It might even be a drop of blood that came from a cracked nipple, which the baby then passed through his system.
1 White blood cells in the stool may be caused by inflammation of the intestines, such as ulcerative colitis, or a bacterial infection. 2  Rotaviruses are a common cause of diarrhea in young children. 3  If diarrhea is present, testing may be done to look for rotaviruses in the stool. Stool with a high pH may mean inflammation in the intestine (colitis), cancer, or antibiotic use. 2  Blood in the stool may be caused by bleeding in the digestive tract. 3  White blood cells in the stool may be caused by inflammation of the intestines, such as ulcerative colitis, or a bacterial infection.