•a rectangular block of copper metal weighs 1896 g. the dimensions of the
block are 8.4 cm by 5.5 cm by 4.6 cm. from this data, what is the density of
copper?

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.  

i think it is a but you should pick diferently if you think it is somthing else