Blood clots are clumps that occur when blood hardens from a liquid to a solid. 1  A blood clot that forms inside one of your veins or arteries is called a thrombus. A thrombus may also form in your heart.  A thrombus that breaks loose and travels from one location in the body to another is called an embolus.
The intestines are the part of the digestive system between the stomach and the anus. They are all coiled up to fit inside your abdomen. 1  The small intestine is a tube about 6 metres long in an adult.2  It is greyish-purple in colour and is about 35mm wide.he intestines are part of the digestive system of the body. They are sometimes called the guts or bowels. This system deals with all the food and drink that you take into your body. You can learn more about the digestive system in the topic 'Your waste disposal system ' .
Despite its name, the small intestine is the largest part of the digestive tract. Even though the small intestine is only about one inch in diameter, the small intestine is approximately 20 to 23 feet long. Because the small intestine is long, the small intestine has a lot of surface area. This large surface area helps to ensure that the nutrients are absorbed. The small intestine has three parts called the duodenum, the jejuneum, and the ileum. As mentioned previously, the duodenum begins at the pyloric sphincter. It then wraps around the head of the pancreas and ends at a turn called the duodenojejuneal flexure. It then becomes the jejuneum.