The heart is a muscular organ that contracts at least once every second to pump blood through the body.

Name: The heart is a muscular organ that contracts at least once every second to pump blood through the body.
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The heart is a muscular organ responsible for pumping blood through the body via contractions. These contractions occur roughly once every second, though the heart rate can vary due to factors such as activity level and emotional state.

The Heart Is a Muscular Organ That Contracts at Least