The circulatory system or cardiovascular system is the organ system that allows the circulation of substances in the body.

Examples of non-circulating organisms are the flatworm (Platyhelminthes phylum). There is no covering layer or fluid in the body cavity of this organism. They have a mouth opening to the digestive system.

This type of circulatory system is seen in most of the invertebrates such as molluscs and arthropods. This yellowing directly in vivo circulating liquid organ in the body cavity as referred hemosöl (washes) and blood (circulation of liquid) with interstitial fluid (tissue fluid) there is no separation between. This combined fluid is called hemolymph. Muscle movements while the animal is moving provide hemolymph movement, but the fluid flow is restricted from one part to another. When the heart relaxes, the blood turns to the heart through the open pores (por). Hemolymph completely covers the inside of the body (hemosol) and wraps all cells. Hemolymph consists of water, inorganic salts and organic compounds. The primary oxygen carrier molecule is hemocyanin. No capillary blood vessels. Also, there are cells which are called hemocyte gezer independently hemolymph and the arthropods are involved in the immune system. After the blood passes through the veins into the body cavity is collected and returned to the heart. On the thorny skin circulation (sea urchins, starfish, etc.), In arthropods (spiders, bees, flies, etc.) And molluscs in (jellyfish, clams, mussels etc.) Are seen.

The main structures of the closed circulation system are heart, blood and blood vessels. The circulatory systems of all vertebrates and caged worms (Annelida phylum) and cephalopods (Cephalopoda class) are closed; that is, blood does not come out of the system of blood vessels - it circulates within the system of veins. Blood vessels consist of arteries, capillaries and veins (veins). While the arteries carry oxygenated blood to the tissues, the veins carry the non-oxygenated blood back to the heart. Blood passes from the arteries to the veins through the capillaries, the capillaries being the thinnest and most numerous blood vessels. Blood vessels can be expanded (vasodilation) or narrowing (vasoconstriction) to direct the blood to the required areas. For example, during intense exercise, the blood can be directed from the intestines to the skeletal muscles, which are now heavily in need of food and oxygen. In the circulatory systems of mammals, the blood passes through the heart twice in a full circulation. Pulmonary circulation, ie small circulation, carries blood between the heart and the lung; Systemic circulation ie large circulation also carries blood between the heart and other parts of the body. In the circulatory systems of the fish, the blood passes through the heart once in a complete circulation. Blood is pumped from the heart to the gills and then flows directly into the rest of the body. After the blood leaves the gills, its pressure drops considerably; therefore, compared to the circulatory system of the breasts, blood flow to vital organs is both slower and less pressurized. This type of circulatory system is not suitable for mammals because the kidneys cannot work effectively at such low pressure. In short, the blood is working with the heart and veins system. In frog heart 3 chambers circulate dirty blood in their bodies.The heart is 3 chambers in the hearts and the heart ventricle has half a curtain.

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