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.
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.