The valves in the heart open and close to move blood in between heart chambers. a. three directions b. two directions c. one direction d. four directions

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Why would you want to know early on if a deadly disease runs in your family? knowing early will eliminate the disease knowing early will let you better manage stress knowing early can you prevent the disease knowing early can remind you that life is short

Mason joined the water polo team at his school. as part of his conditioning, mason's coach requires a 25-minute run during practice. mason's heart rate reaches 125 beats per minute, but his target heart rate zone is 138—183 beats per minute. what should mason do to get the most benefit for his heart? increase the amount of time he runs increase the speed at which he runs decrease the amount of time he runs decrease the speed at which he runs