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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.
What is ribose Browning in canned fish is commonly associated with ribose. Undesirable colour changes in shellfish during canning often involve metal ions, for example, the bl
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Mrs. TT seventy three-year old has a long history of chronic obstructive pulmonary disease (COPD). She came to the medical ward as shortness of breath, wheezing and a cough for the
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Do moulds grow better where it is dark or light? This time leave one culture dish in a warm place where it receives light all the time. Place the other dish in a warm dark plac
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