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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.
Which of the below are stems of plants that are leaf like in form, are green and perform functions of leaves. Additionally, they may bear fruit, flowers and temporary leaves?
Q. What are the merits of the closed circulatory system over the open circulatory system? The closed circulatory system is more resourceful since blood circulates only inside b
what is animals respiration explain
Q. What is meant by the substrates of enzymatic reactions? The Substrates are reagent molecules upon which enzymes act. The enzyme has spatial binding sites for the attachmen
Explain the Components of heart sounds? The first major component is associated with mitral valve closure (M 1) and is due to abrupt arrest of the leaflet motion when the cusps
Characteristics of Ammonium Transport System The following are the characteristics of ammonium transport system: Ammonium transport system is ammonia' repressible
Does natural selection produce an effect directly on genes, on genotypes, or on phenotypes? Explain please.
The pancreas performs digestive and hormonal functions. The enzymes secreted by the exocrine tissue in the pancreas help in the break down of carbohydrates, fats, proteins, and
Waste generated is termed as "Biomedical Waste" which means a waste that may contain human pathogens of sufficient virulence and in sufficient concentrations that exposure to it by
Asexual Reproduction Asexual reproduction is also known agamic reproduction because there is no involvement of gametes in it. Asexual methods of reproduction are
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