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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.
what is cell?
Does RNA molecule have two polynucleotide chains like DNA? Only DNA has two polynucleotide chains. RNA is produced by just one polynucleotide chain. Nucleic Acid Review - Im
Radioactive Labelling Radioactive labelling method has been effectively applied on the chick blastoderm. The method includes labelling one embryo (donor) and grafting a part
how do they adapt to their parasitic mode of feeding
What classifies an animal into the Echinodermata phylum?
what are the uses of computer in biotechnology ??? briefly explain any twenty
Explain the Conveyor (or Band) Dryers? In the conveyor (or band) dryer, the product is distributed on a moving belt, typically of a perforated plate, that passes through a tunn
What are Fitness Tests? Testing is an important evaluation tool for the sports performer as it gives them an insight into their current physical condition and the effectiveness
Q. Direct use values of biodiversity? Direct use values are for those goods that are ensured directly e.g. food and timber. Maintaining a wide range of components of biological
family ,genus, class order , species of mollusca
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