Top Circulatory System Flashcards

The circulatory system is what keeps the blood flowing around our bodies, to keep us alive. The heart is a vital part of the circulatory system, and in the average human lifetime it beats approximately 3 billion times. The blood cells that exist within the circulatory system don’t live a long time; they die and are replenished.

Do you know how any times red blood cells circulate around your body before they return to their place of origin, the bone marrow, to die? Did you know that the speed of the human heart rate is related to human size? In general the larger an animal is, the slower its heart beats. We want to help you learn more about the circulatory system with our fascinating circulatory flashcards.

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