Sit up have both an upper body and lower body rating
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...lower density areas that separate residential and commercial areas from one another.
Answer:
The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts inhaled air into the lungs through its tubular branches, called bronchi. The bronchi then divide into smaller and smaller branches (bronchioles), finally becoming microscopic.
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The lungs are a couple of light, air-filled organs situated on either side of the chest (thorax). The trachea (windpipe) conducts breathed in air into the lungs through its rounded branches, called bronchi. The bronchi at that point separate into littler and littler branches (bronchioles), at long last getting to be tiny.
The bronchioles in the long run end in groups of tiny air sacs called alveoli. In the alveoli, oxygen from the air is assimilated into the blood. Carbon dioxide, a waste result of digestion, ventures out from the blood to the alveoli, where it tends to be breathed out. Between the alveoli is a thin layer of cells called the interstitium, which contains veins and cells that assistance bolster the alveoli.
The lungs are secured by a thin tissue layer called the pleura. A similar sort of thin tissue lines within the chest depression - likewise called pleura. A thin layer of liquid goes about as an oil enabling the lungs to slip easily as they extend and contract with every breath.
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to break down dead or decaying things
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