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Unformatted text preview: remodels itself in response to stress. Sources: Lecture notes and review session material 3. 4. (a) The ejection fraction will decrease because since the valve is replaced, there is no more leaking of blood. Therefore, the heart doesnt have to work as hard to pump a sufficient volume of blood (b) left ventricular systolic pressure would rise because there is no longer a leaking of blood through the mitral valve. 5. Pheochromocytoma causes hyperactivity of the sympathetic nervous system, including increased blood pressure. This tumor results in uncontrolled secretion of epinephrine, and because of this the adrenergic receptors are stimulated excessively. This in effect results in peripheral vasoconstriction and cardiac stimulation. This results in high blood pressure, and therefore hypertension. http://en.wikipedia.org/wiki/Elevated_blood_pressure http://en.wikipedia.org/wiki/Epinephrine...
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- Spring '10