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.
Chronic constipation refers to patients who have had symptoms for more than six months. Constipation can affect quality of life and may be associated with haemorrhoids and anal fissures, and serious underlying causes, such as colorectal cancer. Constipation may be associated with a modest reduction in survival.