What is oogenesis? Oogenesis is a type of gametogenesis. It is the process of producing female gametes, once sex determination of the embryo has occurred. The presence of the SRY gene on the Y chromosome leads to male gonad formation and spermatogenesis, while female gonad development is the âdefault stateâ.
One type of twist or kink is called a small bowel obstruction. This usually happens after a patient has had an abdominal operation like appendectomy, hysterectomy, or colon removal which leads to scar tissue or adhesions developing in the abdomen. The intestines can be come twisted, kinked, or obstructed around this scar tissue. This condition, called a small bowel obstruction, may require surgery for treatment in 20% of patients. Small bowel obstruction can also occur as the result of a hernia. Another type of intestinal twist is called a volvulus. This usually occurs in the colon, where a segment of the colon rotates 180 degrees like a roller coaster loop. This causes a blockage of the colon and may pinch off the blood supply to the colon.
Cirrhosis develops when scar tissue replaces normal, healthy tissue in your liver. It happens after the healthy cells are damaged over a long period of time, usually many years. The scar tissue makes the liver lumpy and hard, and after a while, the organ will start to fail. The scar tissue makes it tough for blood to get through a large vein (the portal vein) that goes into the liver. When blood backs up into the portal vein, it can get into your spleen and cause trouble in that organ, too.