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.
Here are just a few reasons why your baby may have blood in his stool: 1  An anal fissure, which is a small anal tear often caused by passing a hard stool. 2  A food allergy. 3  Maternal blood from delivery or from cracked, sore nipples.  An intestinal 1  infection. An intestinal disorder, such as colitis or intussusception.
Blood in stool as a Symptom. Blood in stool (symptom): Another name for Bloody stool. Â» Introduction: Bloody stool. Â» Causes of Bloody stool. Blood in stool (symptom): Blood appearing in the stool.... more Â». Blood in stool (symptom): Blood in the stool may be a sign of rectal bleeding or gastrointestinal bleeding. Certain conditions may lead to bloody diarrhea. Any ...