The blood system, also known as the circulatory system, is crucial for the transport of nutrients, gases, hormones, and waste products throughout the body. This study note will cover the key topics in the IB Biology syllabus related to the blood system, including its history, the various types of blood vessels, the concept of double circulation, the cardiac cycle, and heart rate.
Galen's theories lacked empirical evidence and were based largely on speculation and philosophical reasoning.
Harvey's work laid the foundation for modern understanding of the circulatory system.
Harvey demonstrated his theories by showing that blood could not be consumed by tissues at the rate it flows, thus proving it must recirculate.
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