Lucille has been told she needs to improve her heart health, and she's ready to get started. there are many activities she is considering for her new routine, but she knows she must first calculate her target heart rate zone. when is the best time for her to begin gathering data to do this calculation?

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.