What are the "tubes" that carry blood back to the heart, What parts act like doors that control blood flow in the heart, What organ removes waste from the blood, How many chambers does the heart have , What wall separates the left side from the right side of your heart, The movement of blood through the heart and the body is called , Can someone with type B+ blood receive A+ blood?, What blood type is the Universal donor?, What is an EKG?, What is "depolarization" of a muscle?, What is "repolarization" of a muscle?, Where is the North Pole?, In Chemistry, what is polarity?.

Cardiovascular System Bell Ringer

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