A cell in an animal divides. Then the new cells divide, forming four cells with only half the usual number of chromosomes. in which of these body systems were these cells probably produced? A skeletal B circulatory C reproductive D central nervous

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

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.