The first in a two-part episode covering the circulatory and respiratory systems, including a discussion of the anatomy of the heart, the process of contraction, and the generation and propagation of electrical activity. I also discuss how the heart functions as a pump, the various types of blood vessels, and control of the heart rate by the brain. Recommended pre-listening is Episode 25: Tissues, Organs and Systems, and Episode 26: Human Organ Systems.

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