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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.
Nutrition occurs in Protozoans All types of nutrition occur in Protozoa. Some protozoans synthesize their own food from inorganic precursors (carbon dioxide, nitrates or ammon
Tunnel Subvalvar Stenosis : This variety is less common and extends from sub aortic area for a variable length of 10-30 mms (tunnel stenosis). In the severe variety, the tun
How come that difference of K+ and Na+, which are both monovalent cations, creates the difference of the net charge of the membrane at different sides?
What is pus Pus is a residual of the inflammatory reaction. It is having a mixture of fragments of dead leukocytes, infectious agents (generally bacteria) and tissues.
Define requirements of Calcium during pregnancy period? The foetus retains about 25-30 g of calcium, over the course of gestation, most of which is deposited in the last trimes
Strobilation - Types of Asexual Reproduction Strobilation is a type of asexual reproduction in which successive segments are separated off from the body one after other. It is
DB is a standard abbreviation used for the quantitative expression of: 1. the density of bacteria in a medium 2. a particular pollutant 3. the dominant Bacillus in a cultu
Many patients who are weak, fearful or shot of breath find it essential to hold tightly to the handrail while walking. If accurate aerobic information is to be obtained handrail su
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Q. How can the visual deficiencies known as myopia and hypermetropia be optically explained? Myopia is the visual condition in which the images are formed previous to (in front
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