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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.
define fringing reef
Q. What is ancylostomiasis? The Ancylostomiasis is a disease caused by the Necator americanus or Ancylostoma duodenale both hookworms belonging to the nematode phylum (roundwor
Explain the De Bakey Type I Dissection? De Bakey Type I Dissection : Initial steps of the operation are same as previously described. Provision for deep hypothermic ci
1. Effect on general health: Noise pollution increases the rate of heart beat, constriction of blood vessels and blood pressure. Noise also causes anxiety, stres
Subphylum Trilobitomorpha Subphylum Trilobitomorpha involves the trilobites. All species are extinct and the fossils point out that they were all marine forms belonging to Pal
Many disease states are heralded by changes in the blood count Leukocytosis can be a sign of infection. Thrombocytopenia can result from drug toxicity. Pancytopenia is ge
Why TPP and TTP are vital for the nerves and cardiac tissues? TPP and TTP are interconvertible and arc involved in carbohydrate metabolism. As discussed above, when there is in
Explain Principle of Fehling's Soxhlet method (Lane-Eynon method)? Reducing sugars are those which have free sugar groups and hence may be estimated directly by titrating the s
Q. Why is the occurrence of eyelids in amphibians in comparison to their absence in fishes an adaptation to terrestrial life? Eyelids associated to lacrimal glands protect and
Binding site is the place on cellular DNA to which a protein (like transcription factor) can bind. Typically, binding sites may be found in the vicinity of genes, and would be inv
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