Describe how local flow in the brain is supported during a cardiovascular shock that initially involved a decrease in systemic BP or MAP. In general, could MAP ever go above normal? When might that happen? (Be Specific)

Under what circumstances might it be inadvisable to administer a clot-dissolving drug to a stroke victim?

Beta blockers are drugs that interfere with stimulation of organs by nerves of the sympathetic system. Would these drugs be useful in treating excessively high blood pressure or excessively low blood pressure?

Watch this animation (http://openstaxcollege.org/l/bloodflow1) to see how blood flows to the brain and passes through the circle ofWillis before being distributed through the cerebrum. The circle of Willis is a specialized arrangement of arteries that ensure constant perfusion of the cerebrum even in the event of a blockage of one of the arteries in the circle. The animation shows the normal direction of flow through the circle of Willis to the middle cerebral artery. Where would the blood come from if there were a blockage just posterior to the middle cerebral artery on the left?