“The circulatory, or cardiovascular, system is a wonder of engineering. Somehow your muscles, tissues, and each cell needs to be able to receive nutrients, expel wastes, and receive oxygen. Your body also needs to be able to transport proteins and hormones throughout. If foreign invaders get into your system, you need to be able to attack and get rid of them and this requires some sort of delivery system to get these fighter cells where they need to go. You also need to keep a constant body temperature and proper PH levels. Whew! Sounds like a big job! Well, all of this, and more, is accomplished through…”
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