Heart
Heart is one of the parts of the cardiovascular system, helps sustain life. First, I want to talk about the shape and position of the heart. Tim is a cone-shaped bodies. It is located in the chest cavity, between the lungs and behind the sternum. Heart the size of a clenched fist, its weight about 10.5 ounces. Next, I will mention the cardiac structures. Heart is made up of three layers: the epicardium (called the pericardium), the heart muscle (myocardium) and endocardium. In fact, epicardial is a fluid bag around the center. The heart has four chambers. Upper two chambers are the atria. They get the blood back to the heart from the body. A lower two chambers are called ventricles to pump blood from the heart to the body. Another thing we should not overlook is the function of the heart. Our heart is to help transport blood, nutrients, oxygen, hormones throughout your body and get the body eliminate waste. In short, the center has such an important role, we should protect it with a healthy lifestyle.
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