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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.
Classification of the river zones The course of a river can be classified in two ways Firstly by its physical characteristics and Secondly by the presence or absen
How are the excretory systems of the three main arthropod classes constituted? In crustaceans a pair of excretory organs known as green glands exists. The green glands collect
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what is the tubular digestive tract?
In the time of Darwin the results of Mendel's research on biological inheritance had not been published, Genetics was not yet developed, neither DNA nor the concept of genetic muta
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1. Explain how bats determine the distance (range) of their target using echolocation. Be sure to describe the properties of their call that make it possible (use a sketch), and ho
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