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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.
Homo erectus first arose about 1.6 million years ago and is believed to have lived for atleast 600,000 years at a time when the transition to Homo sapiens took place. The fosSil fi
Define Tertiary Prevention- preventive strategies for food allergy? Tertiary Prevention: Targets the control of factors that cause symptoms. This strategy would be appropriate
Q. Illustrate Wild Life Sanctuaries? You must have seen how some of the parks are fenced. The intention is to keep the animals from wandering out and not to destroy neighbourin
Determination Reductive hydrolysis of folic acid produces 4-aminobenzoyl glutamic acid which is determined photometrically after diazotization and coupling with N-(1-naphthyl)
Explain the Ethological Approach in Taxonomy The use of behavioural or ethoIogica1 characteristics in animals is relatively new, though extremely useful, particularly in the id
What are the types of plant geotropisms? Why do the stem and the root present opposite geotropisms? The parts of geotropisms are the positive geotropism, that in which the plan
Define Stripping Perforation - Types of Root Perforation It is latral perforation caused by over instrumentation through a thin wall of the root. Most common on the in
What is the OBJECTIVES of evaluation of patient clinical examination ? After going through this unit, you should be able to: 1. Carried out the general physics-examination; 2.
Define pisces
State in brief about the Fungi It is heterotrophic plants, larger than the bacteria. Those that live on the dead tissues of organic substances are called saprophytic. They pla
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