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.
Types of Muscle Tissue. Skeletal muscle is associated with the bony skeleton, and consists of large cells that bear striations and are controlled voluntarily. Cardiac muscle occurs only in the heart, and consists of small cells that are striated and under involuntary control.Smooth muscle is found in the walls of hollow organs, and consists of small elongated cells that are not striated and are under involuntary control. Special Characteristics of Muscle Tissue.Excitability, or irritability, is the ability to receive and respond to a stimulus.uscle Functions. Muscles produce movement by acting on the bones of the skeleton, pumping blood, or propelling substances throughout hollow organ systems. Muscles aid in maintaining posture by adjusting the position of the body with respect to gravity. Muscles stabilize joints by exerting tension around the joint.