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 urine during pregnancy. The presence of blood in the urine (hematuria) during pregnancy may indicate serious problems. During pregnancy, blood in the urine may be due to gallstones or kidney stones. However, the most common cause of the presence of blood is the presence of a urinary tract infection. Here is an overview of the causes and symptoms of hematuria in pregnancy. Causes of blood in urine during pregnancy.