There is also a lot of evidence that probiotics and probiotic foods can help with all sorts of digestive problems (5) This includes irritable bowel syndrome (IBS), ulcers caused by H. pylori infection, and various others (21, 22, 23, 24). For this reason, kefir may be useful if you have problems with digestion.
Bone marrow is the flexible tissue in the interior of bones. In humans, red blood cells are produced by cores of bone marrow in the heads of long bones in a process known as hematopoiesis. On average, bone marrow constitutes 4% of the total body mass of humans; in an adult weighing 65 kilograms (143 lb), bone marrow typically accounts for approximately 2.6 kilograms (5.7 lb).
Blood is the final component of the circulatory system. Blood is made up of a liquid called plasma and three particles called red cells, white cells, and platelets. An average adult has about 5 quarts of blood in their body. The circulatory system works together with other body systems. It works with the respiratory system to deliver oxygen. When you take in a breath of air with your lungs, the oxygen passes into your blood stream.