If you were to graph the numbers of individuals with a certain trait that followed a normal distribution, where on the graph with most individuals appear? A. The top half
B. The lowest end
C. The middle range
D. The highest end​

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.