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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.
Consider the evolution of metabolic pathways. Some biologists believe that these pathways evolved from?
Community Gradients and Boundaries It is often difficult or impossible to determine where one community ends and the next begins. Many communities, in fact, grade continuousl
Q. What is Dietary fibre? Dietary fibre is defined as plant polysaccharide resistant to hydrolysis by the digestive enzymes in the human intestinal tract. It includes: • Str
Define the interaction of vitamin c with iron and cadmium? Toxic levels of dietary cadmium (5-200 ppm) interfere with iron absorption and produces iron deficiency. Supplements
what is the classification of vertibrates
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A species of trilobite was found in the fossil record. At its first appearance, it is similar to an ancestor species but differs from the ancestor in several key characteristics. I
Initiation of Aseptic Cultures The nutrient medium (basal medium) used for plant tissue culture would promote luxuriant growth of micro-organisms such as bacteria and fungi. W
Test for Venous Function Make patient stand, apply a tourniquet at mid-thigh firmly enough to occlude the superficial veins, but not the deep veins or the arteries.
Flowering and Endogenous Rhythms The last four decades of studies in animals and plant physiology have clearly established the existence of a biological clock mechanism to me
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