While the presence of Islam in West Africa dates back to eighth century, the spread of the faith in regions that are now the modern states of Senegal, Gambia, Guinea, Burkina Faso, Niger, Mali and Nigeria, was in actuality, a gradual and complex process.
Hypoventilation is a condition that arises when air entering the alveoli, small air sacs in the lungs that are the site of respiratory gas exchange, is reduced. This causes levels of oxygen to decrease and the levels of carbon dioxide to increase.
Hypoventilation - Failure to take deep breaths can result in the collapse of part of the lungs. This is very common during surgery, especially with general anesthesia, and when breathing is shallow due to pain (such as with rib fractures). Hypoventilation is the most common cause of atelectasis.