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.
Mexican Spanish (Spanish: espaÃ±ol mexicano) is a set of varieties of the Spanish language as spoken in Mexico and in some parts of the United States and Canada. Spanish was brought to Mexico in the 16th century. As in all other Spanish-speaking countries (including Spain), different accents and varieties of the language exist in different parts of the country, for both historical and sociological reasons.