Which labeled structure in the figure carries the cardiac action potential directly into the contractile fibers of the ventricular myocardium? 
Definitions:
Y Chromosome
A sex chromosome that is typically present in male organisms, contributing to male sex determination and related characteristics.
Chromosomes
Threadlike structures made of DNA molecules that carry genetic information in the form of genes.
X Chromosome
One of the two sex chromosomes, X and Y, with the X chromosome carrying a significant number of genes essential for many bodily functions and characteristics.
Genetic Inheritance
The transmission of genetic information from parents to their offspring through genes.
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