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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.
Detritus Food Chains Detritus food chains begin with dead organic matter which is an important source of energy. A large amount of organic matter is contributed by the death o
There has not been rain for several months. A biologist is driving down the highway and notices that a large number of corn fields have corn that is wilted and short. She wonders i
Define Essential Parts of Photocolorimeter - Light Source? The light source is usually a tungsten lamp, for wavelength in the visible range (320-700 nm) and a deuterium or hydr
Eric Davidson isolated and compared the sequences of mRNA transcripts and genomic DNA from the sea urchin. Which of the following is a true statement regarding his findings? A.
what are phylums included in aceolomates?
Intracellular digestion, or cellular digestion, is the breaking in the interior of the cell of big molecules coming from outside or even from the own cell metabolism into smaller m
Q. Etiological factor of diverticular disease? The causes of diverticular disease are not certain, but several factors may contribute to changes in the wall of the colon. These
what are the disadvantages of protozoa?
A microbiology student isolated a hypothetical bacterial cell that seems to quadruple every generation. Knowing that binary fission is an exponential function, derive a mathematica
State the term - Psychophysiology This refers to the study of psychological theories using physiological measures. In other words, psycho-physiologists normally try to understa
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