In this article I would like to see what the circulatory system differs from that of amphibians, crustaceans and reptiles (reptiles).The representatives of these classes are very similar, but the differences are still present, and at times, and not small.So, about all details.
First of all it should be noted that the closed circulatory system of amphibians.Double chamber heart have only bezlegochnye salamanders, the rest is a three-chamber.The circulatory system consists of two amphibious circulation: large and small.The presence of the second round due to the emergence of these animals pulmonary respiration.The heart consists of two atria and ventricle.Thus blood atrial different: in the right - mixed more venous and left - arterial.Walls having intraventricular form folds which prevents mixing of venous and arterial blood.Arterial cone emerging from the ventricle is provided with helical valve.Regarding the arteries, the skin, are responsible for carrying pulmonary venous blood to the skin and easy;sleepy - it provides arterial blood of the upper body, mainly - the head;and aortic arch tolerate mixed blood to the remaining bodies.Small (or pulmonary) circle begins skin and pulmonary artery.The blood is then enriched with oxygen, it is collected in a pair of pulmonary veins that drain into the left atrium.The arcs of the aorta and carotid arteries, which are located in organs and tissues, originates circulation.Venous blood flowing through the veins of a hollow front pair and unpaired hollow back, is in the right atrium.Through front vena cava here as adjudged by the oxidized skin blood, therefore it is in the right atrium mixed.It is because of the presence and characteristics of mixed blood amphibians are characterized by a low level of metabolic processes.The body temperature of changeable and depends on that of the environment.This is one of the cold-blooded animals.
circulatory system similar to that of reptiles amphibians, yet it is more adapted to terrestrial life.At the heart of reptiles consist of two atria, which open into the ventricle.The cavity of the heart of the divided partial partition (with the exception of a crocodile).That is why the blood that comes from the atria, partially mixed.Arterial cone in reptiles is completely reduced.Two of the aortic arch and the pulmonary artery to begin their own heart ventricle.In the left half of his starts right aortic arch, which carries the arterial blood in the head and in the front legs.In the middle of the left ventricle begins aortic arch with mixed blood.The arcs are joined in the dorsal aorta, and the exhaust from her arteries are of mixed blood to other organs of the body.Moreover, it is very rich in oxygen, in contrast to that of amphibia such.
In contrast to the amphibians and reptiles, crustaceans not closed circulatory system.It can rightly be called the most primitive of all the above classes.Blood in the movement is the beating heart, which is placed close to the gills.As such, the blood vessels are present only at higher crustaceans and other blood flows freely about the voids of the internal organs.Often it dissolved special respiratory pigments, they help to bind more oxygen.
As you can see, the circulatory system of amphibians occupies an intermediate position between that of the crustaceans and reptiles.Reptiles are the most adapted to the different conditions of life, in which a significant role is played by the organization of the blood supply to their body.
