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What are the types of blood vessefs? 

    There are three main types of blood vessefs

· The first, Arteries : arteries are thin, muscal tubes that carry oxygenated blood away from the heart and to every part of your body aorta is the body's largest artery

· The second, Veins : These blood vessefs return oxygen - depleted blood to heart. Vein start small (venules) and get larger as they approach your heart. Two central veins deliver blood to your heart. The vena cava is the body's largerst vein

· The third, capillaries : These blood vessefs connect very small arteries and venules. Capillaries howe thin wall that allow oxygen , carbon dioxide, nutrients and waste products to part into and of out eels     

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1 What is the circulatory system ? (Khả Ái)
Your fieart and blood vessels make up the circulatory system The main of function of the circulatory is to provide oxygen, nutrients and formenes to museles, issues and organs throughout your body. Another past of the circulatory system is to remove waste from eelts and organs so your body can dispose of it And, your heart pumps blood to the body through a network of blood vessels. Moreover, the circulatory system have also vena eava, aorta, capillary, pulmonary artery, two ventricle and two atria.
2.What are the types of blood vessels? (Chị Hiểu Nghiên)
There are three main types of blood vessels.
The first, Arteries: arteries are thin, musical tubes that carry oxygenated blood away from the heart and to every part of your body. The aorta is the body's largest artery
The second, Veins These blood vessels return oxygen-depleted blood to heart. Vein start small Crenules) and get larger as they approach your heart. Twe central veins, deliver blood to your heart. The vena cava is the boody's largest vein.
• The third, capillaries. These blood vessels conect connect very small arteries and venutes. Eapillaries howe thin wall that allow oxygen. carbon dioxide, nutrients and waste products to pass into and out of cells.
4 How does the circulatory system work? (Thanh Ngân)
Blood circulation starts when the heart relaxes between two heartbeats. The blood flows from both atria into the ventricles. The following phase is called the ejection period. In the system circulation, the left ventriete pumps oxygen - rich blood into the aorta. The blood travels from it to larger and smaller arteries and into the capillary network Oxygen-depleted blood is collected in veins and travels to the right atrium and right ventricle. The pulmonary Circulation begin in here: the right ventricle pumps Low oxygen blood into the pulmonary artery. The capillaries form a fine network around the pulmonary ve Vesteles. Oxygenated blood through the pulmonary veins and the left atrium into

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