Lindsey Vonnâs road to her final Olympics has encountered some trouble. The American skiing star was treated for a back injury after completing her World Cup Super-G race in St. Moritz, Switzerland on Saturday.
They found that smooth muscle cells on precapillary arterioles clamped down on vessels in response, blocking the flow of red blood cells to downstream tissues. In many cases, the vessels remained constricted after the researchers removed the ligature and restored arterial blood flow.hey concluded that flow is exclusively controlled by smooth muscle cells surrounding the larger arterioles, which make up less than 10 percent of the brainâs blood vessels. These cells also regulated blood flow increases in response to brain activity, which form the basis for functional MRI.
The structure of an arteriole is:             Arterioles are tiny branches of arteries that lead to capillaries.   These are also under the co â¦ ntrol of the sympathetic nervous system, and constrict and dialate, to regulate blood flow.rterioles are small diameter vessels that branch off of your arteries. They inevitably connect arteries to capillaries. You can find them pretty much anywhere in your body.