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Lungs

What are the lungs? The lungs are the organs of respiration in human body. Each human has two lungs. The lungs are coverer by a thin tissue layer called the pleura. The same kind of thin tissue lines the inside of the chest cavity- also called pleura. A thin layer of fluid acts as a lubricant allowing the lungs to slip smoothly as they expand and contract with each breath. The lungs are protected by the rib cage. Where in the body are the lungs located? The lungs are located within our chest cavity inside the rib cage on either side of the heart. The two lings are separated by a structure called the mediastinum. The mediastinum contains the heart, trachea, esophagus, and blood vessels. What is the size of the lungs? Each lung is between 10 and 12 inches longs. The lung on the left is a bit smaller than the lung on the tight because it has to make room for the heart to fit in the chest. Each lung weighs 1.1 kilograms (2.4 lb), therefore making the entire organ about 2.3 kilograms (5.1 l...
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Blood

 What is blood? Blood is a constantly circulating fluid providing the body with nutrition, oxygen, and waste removal. blood is mostly liquid, with numerous cells and proteins suspended in it, making blood "thicker" than pure water. How is blood carried to and from the heart? Blood moves through many tubes called arteries and veins, which together are called blood vessels. these blood vessels are attached to the heart. blood going towards the heart is carried through veins. blood going away from the heart is carried through arteries. How does blood travel through the heart? The pathway of blood through the human heart consists of a pulmonary circuit and a systemic circuit. deoxygenated blood is oxygenated in the pulmonary circuit. deoxygenated blood flows through the heart in one direction, entering through the superior vena cava(heart's veins) into the right atrium. from here, it is pumped through the tricuspid valve into the right ventricle before being pumped out throug...
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Human Evolution - page 1

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 What is meant by human evolution? The term 'human evolution' refers to the processes and changes that led to the appearance of modern humans on Earth. Although it may begin with the last common ancestor of all life, it is usually only concerned with the evolutionary history of primates, in particular, the genus Homo, and the emergence of Homo sapiens as a distinct species of Hominids. How did humans evolve? According to genetic studies, although the first life forms were in the form of bacteria, the record of human evolution extends back more than 6 million years and takes us to the point when human lineage split from that of chimpanzees, our closet living relatives. Although Homo sapiens are the only surviving human species, scientists have evidence of more than 20 species of ancient human relatives. During the process of evolution, humans are involved from the animal order, 'primates' - mammals which include lemurs, monkeys, apes, and tarsiers. When did primate evolu...
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