The motor used in the kitchen stand mixer shown below converts 5 points chemical energy into mechanical energy mechanical energy into electrical energy electrical energy into chemical energy electrical energy into mechanical energy​

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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.