The right ventricle then pumps blood through the pulmonary artery into the lungs. 4. In the lungs, tiny blood vessels called capillaries absorb carbon diox-ide from the blood and replace it with oxygen. 5. Oxygenated blood then flows through the pulmonary vein and into the left atrium. 6.
It is this hormone progesterone that can affect your digestive system by delaying the transit time of food through the intestines and hence may lead to constipation before your period. Usually though, you should find that the period-related constipation eases with the start of menstruation.
Among the most common causes of constipation are. 1  slow movement of stool through the colon. 2  delayed emptying of the colon from pelvic disorders, especially in women. 3  a form of irritable bowel syndrome (IBS) that has symptoms of both IBS and constipation, also called IBS with constipation, or IBS- C.