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.
Mayan Languages. Mayan Languages. Mayan language had many dialects-Qhuche, Cakchiquel, Kekchi, and Mam-is still spoken by about 300,000 persons, of whom two-thirds are pure Maya, the remainder being whites and of mixed blood are still spoken today, although the majority of Indians also speak Spanish.his Proto-Mayan language is thought to have been spoken in the Guatemalan Cuchumatanes highlands where the first expansion occurred around 2200 BCE resulting in the first splitting of the Huastecan branch from Mayan proper which then split into Proto-Yucatecan and Proto-Cholan.