Essay On Circulatory System

The main purpose of circulatory system is to moves oxygen around, moves carbon dioxide out of the body, and move nutrients of the cell into the body. Insect and spider don’t have blood, they have something that called hemolymph, which are combination of blood and interstitial fluid that are in the human body. So that’s why when we squash the bug, we will see some kind of fluid. Compare to the insect, the human body have both blood and interstitial fluid. The blood is in the blood vessels, and interstitial fluid is going to be everywhere else in the body. The circulatory system have 3 vessels, which are arteries, veins, and capillaries. Arteries have the most connective tissue around it because it pumps blood out at high pressure so that it can reach all the parts of the body quickly. Arteries carry blood away from heart, while veins carry blood toward the heart. Vein have one-way valves that prevent blood from flowing backward. Once blood has gone all the way down to the bottom of the feet, it has to get all the way back to the heart. The body lost a lot of that pressure, as the blood flows up, the valves that are found in the veins will actually keep it moving up, and the muscles around compress them in order to forces the blood flowing back to the heart. It is just like we squeezing the toothpaste tooth to get the toothpaste

Organs associated with lymphatic system include the thymus and spleen. Thymus produces T cells. Spleen helps in recycling red blood cells, immunity. This organ located in the upper left of the abdomen. Spleen is the largest organ in the lymphatic system that contains red and white gulp. Red pulp helps in recycling red blood cells. White pulp contains lymphocytes and macrophages. The tonsils are the first line of defense of immunity system. It located in the back of the throat. Tonsils are prevent and trap any bacteria from enter through the ingestion and