Chemistry, 13.01.2021 04:20, jacks0292

PLEASE HELP I CAN NOT FAIL THIS TEST I REALLY NEED HELP ASAP Which of the body's systems directly tells the heart when to beat?
OA. the circulatory system
OB. the nervous system
OC. the respiratory system
OD. the digestive system

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PLEASE HELP I CAN NOT FAIL THIS TEST I REALLY NEED HELP ASAP Which of the body's systems directly t...