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.
Freebase(0.00 / 0 votes)Rate this definition: Obesity hypoventilation syndrome. Obesity hypoventilation syndrome is a condition in which severely overweight people fail to breathe rapidly enough or deeply enough, resulting in low blood oxygen levels and high blood carbon dioxide levels.