|It is defined as a clinical condition which is characterized by narrowing of blood vessels due to excess contraction of muscular wall of the vessels. The medicine that causes constriction of blood vessels is known as vasoconstrictors. Generally vasoconstrictors are given to increase the blood pressure. Vasoconstriction occurs due to the high concentration of calcium in vascular smooth muscle.Scholarly peer review is the process of subjecting an author'sscholarlywork, research, orÂ ideasÂ to the scrutiny of others who areÂ expertsÂ in the same field, before a paper describing this work is published in a journal. The work may be accepted, considered acceptable with revisions, or rejected. Peer review requires a community of experts in a given (narrowly defined) field, who are qualified and able to perform reasonably impartial review.