the heart muscle is called the ................................?
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cardiac muscle or myocardium
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The walls of the heart are made up of three layers, while the cavity is divided into four parts. There are two upper chambers, called the right and left atria, and two lower chambers, called the right and left ventricles. The Right Atrium, as it is called, receives blood from the upper and lower body through the superior vena cava and the inferior vena cava, respectively, and from the heart muscle itself through the coronary sinus. The right atrium is the larger of the two atria, having very thin walls. The right atrium opens into the right ventricle through the right atrioventicular valve(tricuspid), which only allows the blood to flow from the atria into the ventricle, but not in the reverse direction. The right ventricle pumps the blood to the lungs to be reoxygenated. The left atrium receives blood from the lungs via the four pulmonary veins. It is smaller than the right atrium, but has thicker walls. The valve between the left atrium and the left ventricle, the left atrioventicular valve(bicuspid), is smaller than the tricuspid. It opens into the left ventricle and again is a one way valve. The left ventricle pumps the blood throughout the body. It is the Aorta, the largest artery in the body, which originates from the left ventricle.
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The membrane covering the heart is called as pericardium. It is infact a thin layer. Its main function is to protact the heart.
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the ribs and the ribcage protect th heart and other organs.  the daiphram is the big muscle that controlls your breathing and expanding of your lungs
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(1)Heart is  the hollow muscular organ that receives blood from the veins and propels it into and through the arteries.\n(2)It helps to bring blood from the body returns to the right atrium through two large veins, the superior and inferior venae cavae; in addition the blood that has supplied the heart muscle is drained directly into the right atrium through the coronary sinus.
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Skeletal Muscles, the muscles that moves your limbs, eyelids, lift your face, external sphincters of your anus and urinary bladder...\n\nHeart Muscles (Cardiac Ms) - these are also made of striated tissues
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There are three different kinds of muscle, and each does a different kind of work:\n\nSmooth muscle, also known as involuntary muscle, is found in the digestive tract, the urinary system, the blood vessels, and the reproductive organs.  (Yes, you need it to have sex.  Treat your smooth muscle well.)  It's non-stratiated, meaning that it's not very organized compared to other muscle.\n\nCardiac muscle is also a type of involuntary muscle.  It is found only in the heart.  In structure, it is a sort of middle ground between smooth muscle and skeletal muscle.\n\nSkeletal muscle, or voluntary muscle, is anchored to bones and tendons and used for movement.  It is very well organized.
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what are you asking?  The heart is a muscle
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Chordae tendineae which in turn r attached to the papillary muscles.
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In the human body, the heart is normally situated slightly to the left of the middle of the thorax, underneath the sternum (breastbone). It is enclosed by a sac known as the pericardium and is surrounded by the lungs. The apex is the blunt point at the base of the heart. A stethoscope can be placed directly over the apex and count the beats. In normal adults, its mass is 250-350 g, but extremely diseased hearts can be up to 1000 g in mass. It consists of four chambers, the two upper atria (singular: atrium) and the two lower ventricles.\n\nA septum divides the right atrium and ventricle from the left atrium and ventricle, preventing blood from passing between them. Valves between the atria and ventricles (atrioventricular valves) maintain coordinated unidirectional flow of blood from the atria to the ventricles.The ventricular systole consists of the contraction of the ventricles and flow of blood into the circulatory system. Again, once all the blood empties from the ventricles, the pulmonary and aortic semilunar valves close. Finally complete cardiac diastole involves relaxation of the atria and ventricles in preparation for refilling with circulating blood.\n\nThe function of the right side of the heart (see right heart) is to collect deoxygenated blood from the body and pump it into the lungs so that carbon dioxide can be dropped off and oxygen picked up. This happens through a process called diffusion. The left side (see left heart) collects oxygenated blood from the lungs and pumps it out to the body. On both sides, the lower ventricles are thicker than the upper atria.\n\nOxygen-depleted or deoxygenated blood from the body enters the right atrium through two great veins, the superior vena cava which drains the upper part of the body and the inferior vena cava that drains the lower part. The blood then passes through the tricuspid valve to the right ventricle. The right ventricle pumps the deoxygenated blood to the lungs, through the pulmonary artery. In the lungs gaseous exchange takes places and the blood releases carbon dioxide into the lung cavity and picks up oxygen. The oxygenated blood then flows through pulmonary veins to the left atrium. From the left atrium this newly oxygenated blood passes through the mitral valve (also called the bicuspid valve) to enter the left ventricle. The left ventricle then pumps the blood through the aorta to the entire body. Even the lungs take some of the blood supply from the aorta via bronchial arteries.\n\nThe left ventricle is much more muscular (1.3 - 1.5 cm thick) than the right (0.3 - 0.5 cm thick) as it has to pump blood around the entire body, which involves exerting a considerable force to overcome the vascular pressure. As the right ventricle needs to pump blood only to the lungs, it requires less muscle.\n\nEven though the ventricles lie below the atria, the two vessels through which the blood exits the heart (the pulmonary artery and the aorta) leave the heart at its top side.\n\nThe contractile nature of the heart is due to the presence of cardiac muscle in its wall which can work continuously without fatigue. The heart wall is made of three distinct layers. The first is the outer epicardium which is composed of a layer of flattened epithelial cells and connective tissue. Beneath this is a much thicker myocardium made up of cardiac muscle. The endocardium is a further layer of flattened epithelial cells and connective tissue which lines the chambers of the heart.\n\nThe blood supply to the heart itself is supplied by the left and right coronary arteries, which branch off from the aorta.
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muscle tissue cells- smooth (ability to contract) and cardiac(heart)\nepithelial tissue cells- forms the skin and organs
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heart and lungs\n\nhttp://www.ama-assn.org/ama/pub/category/7166.html
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diff muscle types have diff shapes and characteristics\n1. Cardiac muscle - spindle shape, nuclei are centrally located, involuntary muscle, branching, primarily found in the heart\n\n2. Smooth muscle - spindle shape, involuntary, not branching, primarily found in the gastrointestinal tract\n\n3. Skeletal muscle - branching, voluntary, multi-nucleited, straited, found all over the body
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All of the above are well understood, it's just that skeletal and cardiac mucsle are more complicated, therefore there is more information on them.  Smooth muscle contraction can function solely on its intrinsic plexus, its built-in nervous system that only receives fine tuning from the para and sympathetic nervous systems.  It even has its own immune system, Peyer's Patches for example.
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I believe its when one or more of the muscles in the heart becomes oversized which in turn disrupts the functions of the heart.
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In biology, the term you are looking for, I believe, is coelem. Most animals have a "true body cavity", the coelem. This is where the internal organs are located.
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process of elimination. of the 3 muscle types, smooth muscle is the only type withou cross-straitions. these stripes contribute to the fact that cardiac muscle and skeletal muscle contract in the same way. however the heart muscle, intimately interconnected continuous fabric,  has its characteristic intercalated discs which connect adjacent myocardial cells mechanically and electrically. the latter being, when one cell is stimulated it passes the electrical pulse throughout the heart and stimulates all cells (measured in ECG).