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  CIRCULATORY SYSTEM The primary role is to provide essential nutrients, minerals, and hormones to various parts of the body. Alternatively, the circulatory system is also responsible for collecting metabolic waste and toxins from the cells and tissues to be purified or expelled from the body. The human circulatory system consists of a network of arteries, veins, and capillaries, with the heart pumping blood through it beside the organ is: HEART BLOOD, BLOOD VESSEL, AND LYMPHATIC SYSTEM The human heart is separated into four chambers; namely, two upper chambers called atria (singular: atrium), and two lower chambers called ventricles. The way blood flows in the human body is unique, and it is quite efficient too. The blood circulates through the heart twice; hence, it is called double circulation. The main advantage of double circulation is that every tissue in the body has a steady supply of oxygenated blood, and it does not get mixed with the deoxygenated blood. so, in DO

  Sumatra Utara Sumatra Utara capital city is Medan with a population of 2.5 million people. Medan is the 4 th largest city in Indonesia behind Jakarta, Surabaya, and Bandung but it is the largest city outside of Java Island. 63% of people in Sumatra Utara is Muslim, 34% are christian, 2.4% are Buddhism, and 0.22% other. The ethnic group of Sumatra Utara are 45% Batak, 30% Javanese, 8.5% Chinese, 5.7% Malay, 4.1% Nias, and 5.4% others. Sumatra Utara is between the Indian ocean on the west and the straight of Malacca on the east. Sumatra Utara has lake Toba which is the largest volcanic lake which is a volcano surrounded by a lake inside the inside Sumatra.   Sumatra Barat Sumatra Barat capital city is Padang with a population of 1 million people. The total Sumatra Barat population is 5.6 million people. Sumatra Barat only faces the Indian Ocean to the west. Sumatra Barat shares the highest Volcano in all of Indonesia with Jambi, and it is Mount Kerinci. Mount Kerinci r