Stephen Hawking: 'There is no heaven; it's a fairy story'. In an exclusive interview with the Guardian, the cosmologist shares his thoughts on death, M-theory, human purpose and our chance existence. , science correspondent. Sunday 15 May 2011 17.00 EDT First published on Sunday 15 May 2011 17.00 EDT.
Both the growth of a tumor and the repair of a scrape on the knee are similar because they involve a mass amount of blood cells in a particular area. A growth of a tumor is a huge mass of cells that form together an cause it. And like the forming tumor, when you get a scrape on your knee blood cells are clumped together forming a large mass of blood also. They are different because there isn't an opening to a tumor allowing blood cells to flow out. When there is a scrape on your knee, there is an opening/cut, allowing blood cells to flow out properly.
Bursitis - Swelling of the small, fluid-filled sacs that separate your knee bones from nearby muscles and tendons. Tumors - Both cancerous and benign masses sometimes infiltrate the knee. Symptoms. You might have water on the knee if you notice: Swelling. The skin around the kneecap looks and feels puffy compared to the other knee. Stiffness. Range of motion decreases. The leg is difficult to completely bend or straighten. Depending on the cause, you might also notice instability, clicking, or locking of the knee. Pain.