The region bounded by  y =x and  y =x2 is rotated about the y-axis. What is the height of the shell method? 

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A soldier stands rigidly at attention in the heat for a long period and faints. Which sequence best explains the faint?

A patient’s blood pressure has run around 160/100 mm Hg for several years. Her baroreceptors are intact and functioning. Why do they fail to bring her pressure back down?

Rapid repeated stimulation produces a sustained tetanic contraction in skeletal muscle but never in cardiac muscle. Which property is responsible, and why does it matter?

A patient has an end diastolic volume of 130 ml, an end systolic volume of 55 ml, and a heart rate of 72 beats per minute. What is the cardiac output?

The AV node delays the impulse about 0.1 second because its fibers are small in diameter and have fewer gap junctions. Suppose an accessory pathway carried the atrial impulse straight to the ventricles with no delay. What would happen?

In a mesenteric capillary bed the sympathetic nerves to the region are cut. Local metabolic activity in the surrounding tissue then increases sharply. What do the precapillary sphincters do?

At one instant in the cardiac cycle, left ventricular pressure is 46 mm Hg and rising, left atrial pressure is 7 mm Hg, aortic pressure is 79 mm Hg, and left ventricular volume is unchanged at 130 ml. Which phase is this?

A clinician hears a swishing sound that begins right after the first heart sound and is loudest in the fifth intercostal space in line with the middle of the left clavicle. What is the most likely problem?