Cardiac muscle is readily distinguishable from the 2 other types of muscle. What makes it so easy to identify?
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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).
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The heart is an involuntary muscle, which means it moves without your conscious control over it.\nYour leg muscles are voluntary muscles, which means they move when you consciously intend for them to move.
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I could copy the answer, but I have some good links instead. \nSkeletal muscle fibers are multinucleated and fusiform, and basically contain myofibrills. See details at the link:\nhttp://training.seer.cancer.gov/module_anatomy/unit4_2_muscle_structure.html\n\nPay special attention to the myofibrils, the mitochondria and the sarcoplasmic reticulum :-)\n\nIllustrations of structure at different levels (I wish these pictures had been around years ago when I studied this!):\nhttp://www.agen.ufl.edu/~chyn/age2062/lect/lect_19/179.gif\nhttp://www.mhhe.com/biosci/esp/2001_gbio/folder_structure/an/m5/s5/assets/images/anm5s5_1.jpg
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look at this 3D pic then read\n\nhttp://library.thinkquest.org/C003758/rotate.htm\n\nIn the human body, the heart is normally situated slightly to the left of the middle of the thorax, underneath the sternum (breastbone). The heart is usually felt to be on the left side because the left heart (the left part of the heart) is stronger (it pumps the blood out). The heart is enclosed by a sac known as the pericardium and is surrounded by the lungs.Betwen the pericardium and the heart there is a serous fluid to reduce friction during heart contractions. 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 (8-11 oz), but extremely diseased hearts can be up to 1000 g (2 lb) in mass. It consists of four chambers, the two upper atria (singular: atrium ) and the two lower ventricles. On the right is a picture of a fresh human heart which was just removed from a 64 year old British gentleman. The mass for a thin white male is usually 270-300 grams (9-11 ounces) with little fat.\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 (pulmonary circulation)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 (systemic circulation). On both sides, the lower ventricles are thicker than the upper atria.\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 which drains the portal cyrculation too full with nutrients to nourish the body. 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 which is called external respiration. 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, which is 1.3 - 1.5 cm (.5-.6 in) thick, than the right, 0.3 - 0.5 cm ( .1-.2 in) 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 epi
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are you trying to get us to do your homework!!?\n\nwell i will help you lol!\nmuscles always work in pairs because they can only contract and not ..... ? these pairs are known as antagonistic muscles. For the movement to occur, one muscle shortens (contracts) while the other muscle lengthens (relaxes) the muscle that contracts is known as the.....muscle. Muscles which hold the bone in place are known as tendon muscles\n\nsorry I didn't get them all, those were the ones I could do off the top of my head!
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Fish have a 2-chambered heart in which a single-loop circulatory pattern takes blood from the heart to the gills and then to the body.  Mammals have a 4-chambered heart, with complete separation of both systemic and pulmonary circuits.
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Fish have 2 major chambers (one auricle and one ventricle, plus one sinus venosus - before the auricle - and a conus arteriosus - after the ventricle). However, in the lungfishes there is a partial separation of both the main chambers, linked to the existence of a pulmonary blood circuit. \nAmphibians have two auricles and one ventricle, and the latter has deep "pockets" where oxygenated and deoxygenated blood goes, so that these two blood volumes do not mix much  while each flows through its respective circuit.\nReptiles... well, there is no such thing as a "reptile" really but rather three different groups. Both the turtles and the squamates (lizards and snakes) have two auricles and one ventricle, and the latter is partially separated by a spiral septum so that the pulmonary and body circuit do not usually mix (except in special circumstances). \nCrocodiles are related to birds, and just like them, they have a four chambered heart, with two auricles and two ventricles. However, in crocs the oxygenated and deoxygenated blood can get mixed because they have a hole between the paired main blood vessels that leave the heart. \nBoth birds and mammals have also four-chambered hearts with completely separate pulmonary and body circuits. \nCheck the link, there are good schematic illustrations and explanations for each taxon.
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Your question does not make sense!\n\nFrog muscles are arranged like those in other vertebrates and will have similar names. For example your calf muscle is the gastrocnemius, it is the same in the frog and this is the tasty bit you might eat when served frogs legs.
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Diseases of the myocardium\nThere has been increasing recognition of a type of heart disease characterized as primary myocardial disease. The cardiomyopathies are diseases involving the myocardium (heart muscle) itself. They are unique in that they are not the result of hypertensive, congenital, valvular, or pericardial diseases and are rarely the result of ischemic heart disease
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Lung tissue looks like a sponge.  Heart tissue looks like a steak.  Do an image search.
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The American Cancer Society has some general information about the two types of muscle tumors found in the body:\n\n"Smooth muscle is found in our internal organs such as stomach, intestines, blood vessels, or uterus (womb) and causes them to contract. These muscles are involuntary -- that is, we don't control their movement. Example: Leiomyosarcomas are malignant tumors of involuntary muscle tissue.\n\nSkeletal muscle is sometimes called striated (because stripes can be seen inside the cells under the microscope). This is the muscle that allows us to move our arms and legs and other body parts when we want them to move -- that is, voluntary movement. Example: Rhabdomyosarcomas are malignant tumors of skeletal muscle."
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There are approximately 650 skeletal muscles in the human body.
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As we come to the vertebrates, we begin to find real efficiencies with the closed system. Fish possess one of the simplest types of true heart. A fish's heart is a two-chambered organ composed of one atrium and one ventricle. The heart has muscular walls and a valve between its chambers. Blood is pumped from the heart to the gills, where it receives oxygen and gets rid of carbon dioxide. Blood then moves on to the organs of the body, where nutrients, gases, and wastes are exchanged. However, there is no division of the circulation between the respiratory organs and the rest of the body. That is, the blood travels in a circuit which takes blood from heart to gills to organs and back to the heart to start its circuitous journey again.\n\nFrogs have a three-chambered heart, consisting of two atria and a single ventricle. Blood leaving the ventricle passes into a forked aorta, where the blood has an equal opportunity to travel through a circuit of vessels leading to the lungs or a circuit leading to the other organs. Blood returning to the heart from the lungs passes into one atrium, while blood returning from the rest of the body passes into the other. Both atria empty into the single ventricle. While this makes sure that some blood always passes to the lungs and then back to the heart, the mixing of oxygenated and deoxygenated blood in the single ventricle means the organs are not getting blood saturated with oxygen. Still, for a cold-blooded creature like the frog, the system works well. Humans and all other mammals, as well as birds, have a four-chambered heart with two atria and two ventricles. Deoxygenated and oxygenated blood are not mixed. The four chambers ensure efficient and rapid movement of highly oxygenated blood to the organs of the body. This has helped in thermal regulation and in rapid, sustained muscle movements.
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I'm not sure if this is enough info but...\nWhen the Left Atrium is full of blood, the heart muscle in the Left Ventricle relaxes so the muscles attached to the Mitral Valve open.
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Muscle is heavier than fat.
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Try this:\n\nSection 1\n1. What are the distinguishing features of a man from other genus?\n2. What are the distinguishing features of a man from other genus?\n\nSection 2\nIn combining the questions raised in section 1, further subject related questions become apparent:\n1. Does the basis to distinguish a man form other genus differ from that of a woman?\n2. Does the method to distinguish a man from other genus differ from that of a woman?\n3. Are the ideas to distinguish a man from other genus deifferent from that of a woman?\n4. Is this basis to distinguish X from Y different that X from Z?
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there are hundreds of muscles in the human body...what exactly are you looking for?