Your heart is one of the most important muscles in your body. Each day, your heart beats about 100,000 times and, over your life span, about 2.5 billion times! The fibrous pericardium encases, protects and secures the heart. Inside the pericardium is the heart wall, and this is organized into three main layers. The outermost layer of the heart wall is the epicardium, which is also the innermost layer of the pericardium.
Several different languages are spoken in Mexico, with a large majority of the population fluent in Spanish while some indigenous Mexicans are monolingual in indigenous languages.he slow process of replacing Mexico's indigenous languages with Spanish began with the arrival of Spanish forces and colonists in Mexico in the 16th century.
According to the INEGI (the Mexican institution in charge of social and geographical statistics), by 2015 they were 859,607 fluent Mayan speakers in Mexico making it the second most popular native language just after the Nahuatl (the Aztec language), but as any other language the Mayan has some dialects and the number increases to 2,190,608 of people who speak a language considered part of the Mayan family.