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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.
PURPOSES OF ASSESSING GROWTH AND DEVELOPMENT IN CHILDREN Before you assess the growth and development you should be aware of the purpose of monitoring. The purposes are a
Apart from any inherited tendency towards coronary heart disease, what are thought to be the four major risk factors? The four major risk factors for coronary heart disease ar
Which of the following serves as an effector, or as part of an effector, that functions in a negative feedback system? A. Glucagon Receptors in the plasma membranes of alpha-is
What is an organ that belongs to more than one organ system? One answer is the pancreas. It belongs to both the endocrine and digestive systems. Another one is bone marrow. It
Poriferans and cnidarians do not have excretory systems. Do platyhelminthes have an excretory system? Platyhelminthes have a primitive excretory system made of flame cells (als
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Water Relations in Terrestrial Environment Insects are the largest group of metazoans which have most successfully invaded the terrestrial environment. In addition, most arach
Types of Transport Process in Sieve Tubes The metabolites of all the mesophyll cells around the sieve elements join in a common pool to load via the surrounding transfer cells
Products of Cleavage (Morula and blastula) In several cases, the blastomeres in early cleaving stages tend to presume spherical shape like that of the egg earlier than cleava
Which invertebrate groups possess one, three, four or all of the features below? Segmented bodies, hard exoskeleton, jointed legs, compound eyes, three pairs of walkin
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