The walls of the left atrium are slightly thicker than the walls of the right atrium. Oxygen-rich blood from the lungs enters the left atrium through the pulmonary vein. The blood is then pumped into the left ventricle chamber of the heart through the mitral valve. From there, the blood is ready to be pumped into the body to deliver oxygen-rich blood to all bodily tissues.
CGMS offers two tiers of training. Full Certificate students attend a residential Montessori training program in addition to their distance learning component. Primary (Early Childhood) level students spend 3 weeks in one summer session. There are two summer sessions for Elementary students.
Montessori was born on August 31, 1870 in Chiaravalle, Italy. Her father, Alessandro Montessori, 33 years old at the time, was an official of the Ministry of Finance working in the local state-run tobacco factory. Her mother, Renilde Stoppani, 25 years old, was well educated for the times and was the great-niece of Italian geologist and paleontologist Antonio Stoppani.