how many ventricles are in a frog's heart?
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Frogs 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.
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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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c) ventricular pressure falls below atrial pressure\n \nThe atrioventricular valves are the tricuspid and the mitral valves:\nThe tricuspid valve opens and the right ventricle fills with blood from the right atrium.\nThe mitral valve opens and the left ventricle fills with blood from the left atrium.\n\nSystole is when the heart muscle contracts diastole is when the heart muscle relaxes.
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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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4 total, two atrial chambers and 2 ventricular chambers
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http://www.tooter4kids.com/Frogs/life_cycle_of_frogs.htm
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Cardiac Tissue refers to the cells within the heart.  There are three major types of cardiac cells: \nCardiomyocytes : These are the cells that make up the contractile cardiac muscle. They proliferate to repair a damaged heart and regain its contractile power. \nVascular endothelial cells : These cells are located in the inner lining of the heart's newly formed blood vessels. \nSmooth muscle cells : These are located in the wall of the heart's blood vessels
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for short: egg-embryo-tadpole-froglet-frog.\n\nthey start breathing air as soon as they hatched from eggs. the tadpoles breathe with external gills, like salamanders. when they changed into froglet, the gills will start to disappear because at the same time, their external lungs will be developed enough to help them breathe.
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Crab's heart...\nA crab's heart is located dorsally in the center of the carapace and is suspended under the surface of the carapace by strands of connective tissue. It is single-chambered.\n\nWorm heart...\nEarthworms possess five hearts. The calciferous glands between the hearts manage excess calcium in the worm's diet, a problem you may have if you eat a lot of dirt.
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I am surprised that this information is not in your textbook nor presented in your class.  Perhaps you should reread your materials.\n\nAnyway, ventricles are used to pump blood away from the heart.  Atriums received blood from the body and pass it to the ventricles.  Since these areas of the heart are right next to each other, the atriums do not have to work as hard.  This means that they require less muscle mass.  Ventricles move blood to the lungs and to the body.  The blood has a farther distance to travel and the ventricles need to apply more force.  This results in the ventricles having more muscle mass and, therefore, have thicker walls.
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The heart is divided into the upper right atria and upper left atria (plural atrium), and the lower right and left ventricles. A septum divides them. Blood from the veins carries oxygen depleted blood, fewer red blood cells, to the heart and the arteries carry oxygen enriched blood to the body. It is the hearts job, a poweful muscle, to pump blood through the body.\n\nFor more imformation please click on the blue link below in the sources box.
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Hi. Try this link : http://www.ynhh.org/cardiac/heart/index.html
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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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Fishes, as all other vertebrates, have closed circulatory systems; they have a single blood circuit in which the heart pumps the blood toward the gills where it picks up oxygen, and is then distributed to the body. However, our (human) anatomy is very derived with respect to aquatic pisciform vertebrates. In fishes the circulatory system is very symmetrical and more metameric. The best place to look is the gill area, where the major vessels occur. The heart, which looks like an elongated bulb, is situated ventrally right behind the gill basket. The ventral aorta is the major vessel extending forward below the gills, and emits branches to each functional gill. Once they go through the gill filaments, these vessels reunite dorsally and form the dorsal aorta (paired, then joined). Other vessels are difficult to observe as they usually collapse in dead materials, but if you have fresh large specimens you could try injecting a colored rubber solution (VERY carefully) inside the largest vessel you can find and if the walls are not broken, you will get an internal cast of part of the system. \nAlso look for the dorsal longitudinal vessels that are really close to the vertebrae, passing through the haemal arches.
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4 chambers ...\nWithin the adult heart are two parallel independent systems, each consisting of an auricle, or atrium, and a ventricle; from their anatomical positions these systems are often designated the right heart and the left heart.
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This is impossible. 1) What species?\n2) To what stage? Age? etc.\n3) Too many factors to take into account\n4) No way to count.\n\nResearch into frogs and fish have very accurately mapped each stage of embryologic development. Past a certain point, even with dissection and microscopes it is impossible to tell for sure as the brain and nerves alone are so complex and have so many cells it is impossible to count them all.
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As you might already know that the heart has 2 ventricles- the right ventricle and the left ventricle.\n\nRight ventricle:\nReceives deoxygenated blood (without O2) from right atrium (from the body via Superior & Inferior Vena Cava), and pumps it into the lungs, where the blood may remove CO2 and retrieve O2 from the lungs- which isn't very far off.\n\nLeft ventricle:\nReceives oxygenated blood (with O2) from left atrium (from lungs) and pumps it into the system, i.e. the body. \n\nIn order to reach all parts of body (extremities included), the left ventricle has to work extra hard to maintain pressure and achieve this. That means, it also needs the capacity to handle such extra pressures, therefore, the left ventricle wall is thicker than the right one.\n\nThe ratio of right ventricle to left ventricle is 1:3, meaning, the left ventricle walls are 3 times thicker than the wall of right ventricle.