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.
Secondary constipation can be due to pathologic changes, such as disease or intestinal obstruction. Medications may also produce constipation symptoms, also known as drug-induced (ie, iatrogenic) constipation. A medication class commonly associated with constipation is opioids. While opioids are associated with a number of side effects, opioid-induced constipation. Is one of the most common2.