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An adequate level of pressure is needed in the arteries to keep the blood flowing through the cardiovascular system. The chief determinant of arterial pressure is the volume of blood in the arteries and the important determinants of this are the cardiac output and the peripheral vascular resistance. The resistance offered by the arterioles accounts for almost half the total resistance in the systemic circulation. The muscle in the arterial wall allows them to constrict or dilate. When they constrict, the resistance increases and the blood pressure increases. The vasomotor centre in the medulla when stimulated sends impulses via the sympathetic to the smooth muscle in the arteries, arterioles and veins which results in their constriction.
Why are most ammoniotelic beings aquatic animals? Aquatic animals, like crustaceans, bony fishes and amphibian larvae, usually are ammoniotelic since ammonia diffuses more easi
Q. Investigations process of constrictive pericarditis? Electrocardiogram Low voltage complexes can occur. Left atrial enlargement may be seen. Atrial fibrillation occu
Which law of thermodynamics explains the fact that we must eat to gain the energy to perform the functions of life, such as breathing? a. fourth law b. first law c. second law d
File & chemical removal of gutta percha: - K-type file & chloroform is the best choice in small and curved canals. - The pulp chamber floated with chloroform, then k-typ
Defence mechanisms of the host The healthy animal is protected from pathogenic organisms present in the environment by virtue of the effective immune mechanism present from bi
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Briefly explain Lichens organism? Lichens are unique organisms consisting of a symbiotic relationship between a fungus and a photosynthetic organism. They represent a type of s
The heart is enclosed in a membranous sac called the pericardium. It has two layers- the fibrous pericardium which is the outer layer and the serous pericardium that lies inside th
Determine the meaning of Response cost This is a type of punishment in which the subject has to return back the token (positive reinforcement) earned earlier if the subject dis
Occurrence of Biotin Biotin occurs in nature very likely in all living cells, although usually in minute concentrations. In animal organs and in yeast, biotin is mainly cont
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