What is the name of this disorder
(look closely at #21)

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

true is the final answer!

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

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.