Final answer:
The human heart is composed of four main chambers: the atria and the ventricles. The heart is made up of three tissue layers: the epicardium, myocardium, and endocardium. Each part of the heart has a specific function related to the circulation of blood.
Step-by-step explanation:
The human heart is a muscular organ that pumps blood throughout the body. It is composed of four main chambers: the left and right atria, and the left and right ventricles. The atria receive blood and pump it into the ventricles, which then pump blood out of the heart.
The heart is made up of three tissue layers: the outer epicardium, the middle myocardium, and the inner endocardium. The endocardium lines the chambers of the heart, the epicardium forms the outer surface, and the myocardium is responsible for the contraction of the heart.
The atria receive blood from the veins and contract to pump it into the ventricles. The ventricles receive blood from the atria and contract to pump it out of the heart and into the arteries. The coronary arteries supply oxygenated blood to the heart muscle, while the coronary veins carry deoxygenated blood away from the heart.
The valves, such as the mitral valve and the aortic valve, regulate the flow of blood between the chambers of the heart. The septum divides the left and right sides of the heart, ensuring that oxygenated and deoxygenated blood do not mix. So therefore four main chambers of heart are the atria and the ventricles, the three tissue layers are the epicardium, myocardium, and endocardium. Each part of the heart has a specific function related to the circulation of blood.