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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.
Subphylum Urochordata : (13,000 species, sea squirts) Notocord is dorally situated, nerve tube dorsally situated and is hollow, chordate characteristics seen mainly in bilatera
In the time of Darwin the results of Mendel's research on biological inheritance had not been published, Genetics was not yet developed, neither DNA nor the concept of genetic muta
Explain the factors that lead to vitamin K deficiency? The factors that lead to vitamin K deficiency include: 1) Marginal dietary intake if one undergoes trauma and extensiv
Q. What are the periods of the second meiotic division? Meiosis II is divided into metaphase II, prophase II, anaphase II and telofase II.
How last chamber of heart in cockroach receives blood without having ostia?
Q. How do taenias obtain food and make gas exchange? The Tapeworms have sucking and hooks structures on their heads (scolex) that fixate the parasite in the gut wall these stru
Explain the Radiographic Success of Root Canal Treatment Elimination or lack of development of an area of rarefaction (= Radiolocency ) for a minimum of I year after treatment
what are the characteristis in species in the phyla division
A 19 year old model for Glamour magazine tripped over an extension cord causing injury to her epidermis. She is afraid the injury will leave a scar. Based on your knowledge of rege
Glucokinase In the fed state, clearance of blood glucose is mainly by liver via glucokinase. Glucokinase, which is an inducible enzyme, removes most of the blood glucose fr
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