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.
The red blood that enters the fetus passes through the fetal liver and enters the right side of the heart. The red blood goes through one of the two extra connections in the fetal heart that will close after the baby is born. The hole between the top two heart chambers (right and left atrium) is called a patent foramen ovale (PFO). This hole allows the reddest blood to go from the right atrium to left atrium and then to the left ventricle and out the aorta. As a result the blood with the most oxygen gets to the brain. Blood coming back from the fetusâs body also enters the right atrium, but the fetus is able to send this blue blood from the right atrium to the right ventricle (the chamber that normally pumps blood to the lungs).