The heart pumps the blood along a series of tubes that are collectively called blood vessels. The middle layer of the heart wall is the myocardium; this is the actual muscular layer of the heart responsible for ... around the heart called the pericardial cavity. The walls of your heart are made up of three layers. The thick muscle layer of the heart is the myocardium. Most of the layers have a clear boundary between them, however the tunica externa has a boundary that is ill-defined. These layers are surrounded by the pericardium, a thin outer lining protecting your heart. 0 Answers/Comments . The inner layer is called the endocardium and is in contact with the blood that the heart pumps. This is the thinnest ‘layer’, accounting for <20% of the wall thickness. Myocardium – a thick muscular middle layer that contracts and squeezes blood out of your heart. Here's more about the layers of the stomach. The main job of the mucosa is to secrete mucus that protects the stomach from its own acids. They are also quite thick with only a small space, known as the lumen, down the centre. It’s also the thickest of the three layers. Cardiomyocytes are specialized muscle cells that contract like other muscle cells, but differ in shape. The middle layer of the heart wall is the myocardium—the muscle tissue of the heart and the thickest layer of the heart wall. tricardium endocardium pericardium myocardium . The two small upper chambers are the atria. It is the middle layer of the heart and produces pressure. Venous blood enters the _____ _____ from the superior and inferior Venae Cavae. adj., adj myocar´dial. The largest artery in the body is the superior vena cava. The muscular middle layer is called the tunica media, and the outermost layer is called the tunica adventitia. The highest number of the blood pressure is called the diastolic. So on the inside, you have what's called the endocardium. This outer layer consists of connective tissue covered by a layer of epithelium. The inner wall of the heart has a lining called the endocardium.The myocardium consists of the heart muscle cells that make up the middle layer and the bulk of the heart wall. The myocardium consists of the heart muscle cells that make up the middle layer and the bulk of the heart wall. The myocardium is the muscular middle layer of the heart wall that contains the cardiac muscle tissue. Often, only one part of the heart is thicker than the other parts. The endothelial (or epithelial) layer of the inner myocardial surface . True . The middle layer of blood vessels is composed of smooth muscle cells that control the blood vessel's diameter. The heart itself is composed of muscle tissue, and is subdivided into three layers: Epicardium — this is the outermost layer of the heart, and it helps to reduce friction by containing some fat amongst the coronary arteries. False. At the pyloric end of the stomach, the circular muscle layer becomes greatly thickened to form the pyloric sphincter. The thickness of the myocardium varies according to the pressure generated to move blood to its destination. The heart is enclosed within a double layered pleural sac called the pericardium. A double-layered membrane called the pericardium surrounds your heart like a sac. Structurally, the human heart consists of four chambers and is arranged in right and left halves separated by a thick, muscular wall, the septum. The heart is composed of three layers; the epicardium, the myocardium, and the endocardium, illustrated in Figure 2. So there are three layers to the heart muscle. Normally its boundary is considered when it meets or touches the connective tissue. The serous pericardium is composed of a parietal layer and a visceral layer. The walls of the atria are thinner than the ventricle walls because they have less myocardium. 1. The middle layer, the myocardium, is the largest and does most of the work that makes the heart contract to pump the blood throughout the body. But they are more than just simple pipesArteriesArteries carry blood away from the heart.Each time the heart beats it fires blood into the arteries at a high pressure, so they need to be tough so that they don't burst. Myocardium - is the middle thick layer of cardiac muscle, which gives the heart its special pumping ability. 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