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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.
Population Parameters and Regulation Population can be defined as a group of organisms of same species occupying a specific area at a particular time, such as all the deer or
Define the Toxicity of Vitamin B 12 ? Intake of 1000 μg vitamin B 12 has never been reported to have any side-effects. Similar large amounts have been used in some preparati
Enumerate the Sizes and shapes of eukaryotic and prokaryotic cells It is thus possible, due to these similarities, to generalise about the structures and functions of cells. In
The passive transport of molecules across a membrane does not require an input of metabolic energy. Rate of the diffusion or transport is proportional to the concentration gradient
Q. What is the first polar body? How different is it from the oocyte II? In oogenesis the oogonium differentiates into oocyte I (2n) and this cell enters meiosis and after fini
Q. Proteins requirement in dyslipidemia? Proteins: While the quantity of protein does not impose any significant impact on the serum lipoproteins, it is the quality of protein,
Protozoan phyla
Uses of Plural Embryos Although the basic that trigger causes polyembryony are not fully understood, there has been no dearth of interest in exploiting supernumerary embryos.
endoplasmic reticulum
Solubility of Oxygen It is also important to know that solubility of gases decreases with the presence of solutes or increased salinity. Table shows the solubility of oxygen a
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