How the Heart Contracts - Step by Step

The video tutorial explains the process of cardiac muscle contraction, starting from the action potential in cardiac muscle cells to the contraction itself. It covers the heart's electrical pathway, including the SA node, AV node, and Purkinje fibers, and highlights the importance of electrical connectivity among heart cells. The tutorial also discusses the varying speeds of electrical signals in different heart regions and the role of calcium in muscle contraction. The video aims to make biology engaging and informative.

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