Atherosclerosis in the carotid arteries, two large arteries in the neck that carry blood to the brain, is a major risk factor for ischemic stroke. Symptoms of stroke include: 1  Sudden numbness, weakness, or paralysis of face, arm or leg, especially on one side of the body. carotid endarterectomy is a surgical procedure in which a doctor removes fatty deposits blocking one of the two carotid arteries, the main supply of blood for the brain.
Polar stratospheric cloud. Polar stratospheric clouds or PSCs, also known as nacreous clouds (/ËneÉªkriË.És/, from nacre, or mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of 15,000â25,000 meters (49,000â82,000 ft).
Rating Newest Oldest. Best Answer: 1. It's where the ozone layer is 2. It extends from about 15 kilometers to about 50 kilometers in altitude. 3. The temperature in the stratosphere increases with height. 4. Very little air moves between the troposphere and the stratosphere so the stratosphere contains hardly any water.This means that stratospheric clouds only form if it is so cold that the tiny amount of water present can condense to form ice crystals.Source(s): dreamoutloud2 Â· 9 years ago.. Very little air moves between the troposphere and the stratosphere so the stratosphere contains hardly any water. This means that stratospheric clouds only form if it is so cold that the tiny amount of water present can condense to form ice crystals. Source(s): dreamoutloud2 Â· 9 years ago.