The heart is divided into  Cloze (1): JXUwMDNlJXUwMDA5JXUwMDFhJXUwMDA3 chambers .

The two upper chambers are known as Cloze (2): JXUwMDM5JXUwMDE0JXUwMDA3JXUwMDFiJXUwMDBhJXUwMDBmJXUwMDA5JXUwMDE2 while the two lower chambers are known as Cloze (3): JXUwMDJlJXUwMDEzJXUwMDBiJXUwMDFhJXUwMDA2JXUwMDFiJXUwMDBhJXUwMDBmJXUwMDA5JXUw MDE2 .

The right auricle receive Cloze (4): JXUwMDNjJXUwMDAxJXUwMDBhJXUwMDE3JXUwMDAxJXUwMDFlJXUwMDAyJXUwMDBiJXUwMDBmJXUw MDE1JXUwMDExJXUwMDAx blood from the body organs except the lungs.

while the left  auricle receive Cloze (5): JXUwMDM3JXUwMDE3JXUwMDAxJXUwMDFlJXUwMDAyJXUwMDBiJXUwMDBmJXUwMDE1JXUwMDExJXUw MDAx blood from the lungs the through the pulmonary vein.