Do the trees in your area have much chlorophyll in them right now? do you think the trees in your area will have more or less chlorophyll in three months than they did now? leaves usually change colors during the fall season.

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.