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Best Answer: Intercalated discs are areas where cardiac muscle cells (among a few other cell types) are joined together. These discs contain gap junctions, which are small pores that connect the cytoplasm of one cell to the next.
The heart has four chambers through which blood is pumped. The upper two are the right and left atria. The lower two are the right and left ventricles. Four valves open and close to let blood flow in only one direction when the heart beats: 1  The tricuspid valve is between the right atrium and right ventricle.