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Muscles

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What are the muscles? muscles are soft tissues, which can be described as the 'engine' that our body used to people itself. Like any other engine, muscles turn energy into motion. They are long-lasting, self-healing and able to grow stronger with practice. A normal human body has more than 600 muscles. They account for about half of a person's weight. What do muscles do? Muscles do everything from allowing us to walk to keep our blood flowing. It would be impossible for us to do anything without our muscles. Muscles have the ability to contract and expand, and so they can maintain the position of the body parts, as well as facilitate the movement of internal organs. What are the muscles made up of? Muscles are made up of fibres, a type of elastic tissue. Each fibre is made up of long thin cells which are packed in bundles. Each bundle is wrapped in a thin skin called the perimysium. The bigger the muscle, the more bundles of fibres it has. Inside the muscles, there are nerv...
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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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