The heart is the key organ in the circulatory system. The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells. It is located in the middle of the chest and slightly to the left of the breastbone. The human heart is divided into four chambers: right atrium, right ventricle, left atrium, and left ventricle. The right atrium and ventricle are usually called the right heart, while the left atrium and ventricle are called the left heart.
In a healthy heart, blood flows through the blood vessels in only one direction. Pericardium is membrane that surrounds the heart containing a small amount of fluid. It helps protect and lubricate your heart. The wall of the heart is composed of three layers, covering the epicardium, myocardium, and endocardium.
The Functions of Heart
The heart pumps blood through the blood vessels by repeated, rhythmic contractions. Then, the blood provides your body with the oxygen and nutrients it needs as well as helps remove metabolic waste.
Who is a Cardiologist and Cardiothoracic Surgeon?
Cardiologists treat diseases such as heart defects and work together with a heart surgeon (cardiothoracic surgeon) to open up narrowed or blocked blood vessels in the heart.