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A Simple Guide to The Lung and Its Function (What You Need To Breathe) (A Simple Guide to Medical Conditions) | Kindle Edition

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“There's so much pollution in the air now that if it weren't for our lungs there'd be no place to put it all.”By Robert Orben“Forests are the lungs of our land, purifying the air and giving fresh strength to our people.”By Franklin D. Roosevelt“It opens the lungs, washes the countenance, exercises the eyes, and softens down the temper; so cry away.”By Charles Dickens“My next breath may very well be in your lungs. Store it wisely, because my life depends on it.” By Jarod KintzThe inspired and expired air may be sometimes very useful by condensing and cooling the blood that passed through the lungs.Move to your heart, Breathe.Close your eyes and breathe deeply - slowly -fill your lungs with love and gratitude -exhale each and every trouble -again and again - gratitude in, troubles out.By Jonathan Lockwood HuieThis was going to be a book on the anatomy and physiology of the respiratory system.It still is a book on the human lung and what a human needs to Breathe.I will try to add some descriptions in simple vernacular words and make it more fun to read.The LungsThe lungs are a pair of air-filled organs located on either side of the chest.The windpipe brings inhaled air from the nose or mouth into the lungs through its tubular branches called bronchi.The bronchi then divide into smaller and smaller branches (bronchioles) finally becoming microscopic.The bronchioles eventually end in microscopic air sacs called alveoli.In the alveoli oxygen from the air is absorbed into the blood.Carbon dioxide a waste product of metabolism travels from the blood to the alveoli where it can be exhaled.Between the alveoli is a thin layer of cells which contains blood vessels and cells that help support the alveoli.The lungs are covered by a thin tissue layer (pleura) which also line the inside of the chest cavity.A thin layer of fluid in the pleural cavity works as a lubricant allowing the lungs to move smoothly as they expand and contract with each breath.When a person breathes in, the diaphragm and the muscles between the ribs contract and expand the chest cavity.This expansion lowers the pressure in the chest cavity below the outside air pressure.Air then enters through the airways from high pressure to low pressure and inflates the lungs.When a person breathes out, the diaphragm and intercostal muscles relax and the chest cavity gets smaller.The decrease in volume of the cavity increases the pressure in the chest cavity above the outside air pressure.Air from the lungs (high pressure) then flows out of the airways to the outside air (low pressure). The cycle then repeats with each breath.Air finally ends up in the 600 million alveoli.As these millions of alveoli fill up with air, the lungs get bigger.It is the alveoli that allow oxygen from the air to pass into the blood.All the cells in the body need to use oxygen every minute of the day.Oxygen passes through the walls of each alveolus into the tiny capillaries that surround it.The oxygen enters the blood in the tiny capillaries riding on the hemoglobin of the red blood cells and traveling through blood vessels to the heart.The heart then sends the oxygenated blood out to all the cells in the body.When it is time to breathe out, everything happens in reverse:The diaphragm relaxes and moves up pushing air out of the lungs.The rib muscles become relaxed and the ribs move in again creating a smaller space in the chest.By now the cells have used the oxygen they need and the blood is carrying carbon dioxide and other wastes that must leave the body.The blood comes back through the capillaries and the wastes such as CO2 enter the alveoli.Then the breathing out occurs in the reverse order of how they came in.TABLE OF CONTENTIntroductionChapter 1 The LungsChapter 2 Lung FunctionChapter 3 Trachea Chapter 4 BronchusChapter 5 AlveolusChapter 6 Protection of the LungsChapter 7 The Lung and Diseases

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