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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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Heart

 What is the heart? the heart, one of the most vital organs of the human body, is a muscular organ with a circulatory system, which is responsible for pumping life-sustaining blood through the blood vessels spread throughout the body, by repeated, rhythmic contractions. from the moment it begins beating, until the moment it stops, the human heart works tirelessly. where in the human body is the heart located? in the human body, the heart is located a little to the left of the middle of the chest, behind the breastbone, and is well protected by the rib cage. it is placed anterior to the vertebral column and posterior to the sternum or breastbone. what is the how many parts does a human heart have? human heart? a normal human heart is about the size of a clenched fist and it weighs approximately 250 to 300 grams in females and 300 to 350 grams in male. right from birth, as the body develops, the heart grows at the same rate as the fist. what is the internal structure of the heart? th...
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