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.
Sometimes, the blood may not even be visible on the stool, and this is termed occult gastrointestinal bleeding. By far, the most common causes of visible blood in the stools are diverticulitis and hemorrhoids. Other conditions and situations that can cause blood in the stools include: colon cancer. non-cancerous growths, such as polyps. intestinal infections (bacterial enterocolitis) that can be caused by foodborne pathogens, such as salmonella and E. coli.