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Galen also made the mistake of assuming that the circulatory system was entirely open-ended. [16] Galen believed that all blood was absorbed by the body and had to be regenerated via the liver using food and water. [17] Galen viewed the cardiovascular system as a machine in which blood acts as fuel rather than a system that constantly ...
In vertebrates, the circulatory system is a system of organs that includes the heart, blood vessels, and blood which is circulated throughout the body. [1] [2] It includes the cardiovascular system, or vascular system, that consists of the heart and blood vessels (from Greek kardia meaning heart, and Latin vascula meaning vessels).
Arthropods and most mollusks have an open circulatory system. In this system, deoxygenated blood collects around the heart in cavities . This blood slowly permeates the heart through many small one-way channels. The heart then pumps the blood into the hemocoel, a cavity between the organs. The heart in arthropods is typically a muscular tube ...
Map showing the extent of Mesopotamia. The Civilization of Mesopotamia ranges from the earliest human occupation in the Paleolithic period up to Late antiquity.This history is pieced together from evidence retrieved from archaeological excavations and, after the introduction of writing in the late 4th millennium BC, an increasing amount of historical sources.
Seated parturient figurine from the Halaf period. Anatolia - 5th millennium BC. Walters Art Museum - Baltimore. The prehistory of Mesopotamia is the period between the Paleolithic and the emergence of writing in the area of the Fertile Crescent around the Tigris and Euphrates rivers, as well as surrounding areas such as the Zagros foothills, southeastern Anatolia, and northwestern Syria.
The regional toponym Mesopotamia (/ ˌ m ɛ s ə p ə ˈ t eɪ m i ə /, Ancient Greek: Μεσοποταμία '[land] between rivers'; Arabic: بِلَاد ٱلرَّافِدَيْن Bilād ar-Rāfidayn or بَيْن ٱلنَّهْرَيْن Bayn an-Nahrayn; Persian: میانرودان miyân rudân; Syriac: ܒܝܬ ܢܗܪ̈ܝܢ Beth Nahrain "(land) between the (two) rivers") comes from the ...
The heart is located in the middle of the abdomen with its tip slightly towards the left side of the abdomen. Disorders of the heart lead to heart disease and cardiovascular disease and can lead to a significant number of deaths: cardiovascular disease is the leading cause of death in the U.S. and caused 24.95% of total deaths in 2008. [19]
Diagram of the circulatory system. SVC/IVC - Superior/Inferior vena cava. The heart is the driver of the circulatory system, pumping blood through rhythmic contraction and relaxation. The rate of blood flow out of the heart (often expressed in L/min) is known as the cardiac output (CO).