What chemical compounds are in a sunflower?

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

i think the answer would be d

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.