Circulatory System" is a part of the college-level Principles of Biology course series textbooks. It is a tutorial written in questions and answers format to describe the anatomy and physiology of the circulatory system, including the heart, cardiovascular system, neural control of the heart, and evolution of the heart. It is a study guide with in-depth explanations. Each section is a modular unit that is self-contained for easy reading. The principles and concepts are introduced systematically so students can learn and retain the materials intuitively

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