1 lactase intolerance, and. 2  malabsorption of certain foods. 3  Much of the gas generated is due to microbial breakdown of foods so that gases, for example, hydrogen, carbon dioxide, and methane are generated; the odor is from other trace waste gases or compounds such as skatole and sulfur-containing substances.
Best Answer: Blood enters the heart through the right atrium, it then goes into the right ventricle to be pumped via the pulmonary artery to the lungs to be re-oxygenated. After that it heads, via the pulmonary vein, to the left atrium in the heart to be pumped around the rest of the body again via the aorta.
Blood may also fill inside the lungs but this usually occurs as a result of severe trauma and the cause is clearly evident, like in a gunshot or stab wound. In most trauma cases where blood can fill into the lungs, the lungs collapse and the blood accumulates around the lungs in the pleural space (hemothorax).