Developed by a pediatrician, this book focuses on the amazing design and functionality of the human body’s circulatory system. You will discover amazing facts like:

The human heart beats 100,000 times a day, and one drop of blood has 5 million red blood cells in it
A timeline of important discoveries and innovators as well as key anatomical terms and concepts
Discussions of disease and proper care for optimal health!

The third book in the popular elementary anatomy series God’s Wondrous Machine, focuses on the heart, blood, and blood vessels that make up the body’s circulatory system. Understanding the mechanics of this system in transporting nutrients, blood, chemicals, and more to cells within the body is key to understanding how it helps fight disease as well as maintain a properly balanced temperature. Readers learn how the deliberate design of their bodies enables it to function as it should, just as God meant for it to.

About the Author

Dr. Lainna Callentine, MEd, MD, is a physician, adjunct professor at Wheaton College, writer, speaker, and creator of Sciexperience, as well as a missionary doctor that serves the uninsured. She affirms the motto from Galatians 5:13, “serving one another in love” and left formal medicine in the E.R. to homeschool her children and pursue her passion in teaching.

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