CHAPTER 37 – THE CIRCULATORY AND RESPIRATORY SYSTEMS

The human circulatory system has three components: the . heart, the . blood vessels, and the . blood. I. THE HEART. The function of the heart is to keep the blood moving constantly in the body. The heart is a large organ made of . cardiac muscle. cells. that have a high number of . mitochondria. Humans (plus other mammals and birds) have a ................
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