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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.
Hi, I have this presentation about the kingdom of fungi, and no website could clearly explain the two processes of fragmentation and sporulation. I mean what are their steps? And w
What is Genetic Recombination and Evolution ? Variation among the offspring of living organisms results from genetic recombination through sexual reproduction and mutation. Va
Variation exhibited in shared traits present in a population is due to alleles of the shared genes. can be influenced by interactions of alleles of multiple genes. Can be influence
PHYLUM PLATYHELMINTHES Definition and Introduction Bilateral and protostominal organ grade eumetazoans without a body cavity ( acoelomates) platyhelminthes means fl
Medical and First Aid - Factors Affecting Occupational Health Depending on the type of work the industry must make arrangement for readily available medical facility. A nearby
define histon protein?
What do numeric pyramids represent? Numeric pyramids show the number of individuals in each trophic level of a food chain.
DEFECT S OF NERVOUS SYSTEM - 1. Ataxia - Lack of muscle-cordination due to damage of cerebellum. 2. Dyslexia - In ability of a person to comprehense written l
Zinc Zinc regulates over a dozen important enzyme systems involved in metabolism of protein and carbohydrates. Zinc is also required for maintaining responsiveness of the immu
Depleted (Vulnerable) Species These are the species whose numbers are greatly reduced from those of the recent past, and they are continuing to decrease. It is the continued d
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