The exodus was a journey that moses had lead his people out of. To the Hebrews the release from slavery proved that God was protecting and watching over them.
The left and right ventricles are stronger pumps. The left ventricle is the strongest because it has to pump blood out to the entire body. When your heart functions normally, all four chambers work together in a continuous and coordinated effort to keep oxygen-rich blood circulating throughout your body.
Normally, the four chambers of your heart perform a smooth routine, beating 60 to 100 times a minute to send blood throughout your entire body. The lower ventricles and upper atria work together to efficiently and consistently squeeze for blood flow.