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A brief electrical charge that travels down the axon of a neuron is called what

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3) Cerebral Circulation Neurons of the brain: Unable to store _________ therefore must have dependable blood flow: must also have adequate Ow supply (irriversible brain damage if there is no blood flow for longer than _ minutes) Blood Flow through the Brain: -750 ml/min (significant amount)-________ over different psychological conditions (constant blood flow)-Constant over a broad range of MaPs-Altered by changes in the concentration of O2 and CO2 in the blood-Increased CO2 or decreased O2 = _________ of cerebral BVS (weird)(Brain realizes it needs more blood which has O2, so it increases blood flow) -Temporary decrease in cerebral blood flow= fainting (don/t sit someone up immediately)

2) Coronary CirculationFlow of blood through the coronary vessels-First is the aorta which makes sense that the heart is supplying itself first. Blood flow through the cornary vessels:Resting= 250 ml/min = _________% of cardiac output is going to the heartExercise=1250 ml.min (due to dilation of the coronary vessels) _________l of O2 by the cardiac muscle (Heart needs more blood)Resting or exercise=65% of the O2 in the arterial blood flowing to the heart removed (more efficient)=Efficiency removal (most other tissues only 25% of O2 is removed)______ Flow is the only way to make more O2 available. If oxygenated blood doesn't come to tissues--> tissue death occursNOTE: heart attacks are more likely to occur when exercising. This is because vasodilation is occuring. Dilation of BVS leads to decreased heart rate + blood pressure and in extrem cases--> heart attack

The excerpts best support which of the following arguments about postwar United States foreign policy?A. Some Americans called for the United States to reduce tensions with the Soviet Union.B. The United States sought to recolonize countries that had gained independence.C. Many Americans opposed the creation of new alliances in Europe.D. Fear of Soviet expansion led to greater United States international involvement.

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