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Baroreceptor activity affects coronary vascular resistance reflexly. With carotid occlusion, baroreceptor hypotension leads to reflex adrenergic stimulation, increased metabolic activity and secondary vasodilation. When this is prevented by beta blockade, reflex coronary vasoconstriction secondary to carotid hypotension is unmasked. Alpha1 adrenoreceptor stimulation is capable of causing epicardial vasoconstriction in ischaemic myocardium, thereby influencing favourably the transmural distribution of blood flow to the subendocardium during exercise. Activation of chemoreceptors initially causes coronary dilation, a reflex that is mediated by vagi and can be abolished by atropine e.g. Bezold Jarisch reflex.
Explain the Nutritional Changes and Requirement - Geriatric Nutrition? Nutrition is affected in two way -due to the changes in physiological function with aging having effect
what is endosperm haustorium
Gum Karaya Gum karaya (sterculia gum) is the dried gummy exudate from Sterculia urens Roxburgh and other species of Sterculia (Family: Sterculiaceae) or from Cochlosperm
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The trp (tryptophan) operon which is shown in the figure will have five structural genes encoding enzymes for tryptophan biosynthesis with an upstream Ptrp (trp promoter)
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Define Food Science as a Discipline and Modern Developments? As an undergraduate student you may have taken a course in food science and technology. Do you recall, what did the
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What is the valve that separates the aorta from the heart? What is the importance of that valve? The valve among the left ventricle and the aorta is the aortic valve. The aorti
Describe about Acyanotic Congenital Heart Disease ? The following lesions will be discussed here: Left to right shunts: Atrial Septal Defect (ASD), Ventricular Septal Defect
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