Great Pacific garbage patch. The Great Pacific garbage patch, also described as the Pacific trash vortex, is a gyre of marine debris particles in the central North Pacific Ocean discovered between 1985 and 1988. It is located roughly between 135Â°W to 155Â°W and 35Â°N and 42Â°N. The patch extends over an indeterminate area of widely varying range depending on the degree of plastic concentration used to define the affected area. The patch is characterized by exceptionally high relative pelagic concentrations of plastic ...
A bruit is caused by turbulent blood flow in an artery which supplies blood to the brain. Increased stenosis of a carotid artery results in increased duration, intensity, and pitch of the bruit. A carotid bruit and a basal heart murmur are easily confused.
Many, many women who are pregnant find themselves short of breath at some point. One reason is that the uterus is expanding and pushing up into the abdomen. This squeezes the lungs a bit, reducing the space they have for oxygen exchange. An even bigger cause for shortness of breath is progesterone, a hormone that increases during pregnancy. High progesterone levels cause pregnant women to breathe faster. The rise in progesterone begins early in pregnancy, and the shortness of breath it causes can come as a surprise. While shortness of breath can be worrisome, most of the time it is harmless and due to the normal changes of pregnancy.