Saturday, 03 October 2015 09:41

Breathing

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Breathing - Everyone Does It

 

 

 

Breathing Process

 

Breathing is something that occurs naturally. Cells in your body need oxygen to release energy which is needed to keep your body alive. The process of breathing starts with air being drawn through the mouth or nose down the trachea and into the lungs where it is delivered to all the cells in the body through the bloodstream. The bloodstream is also responsible for gathering carbon dioxide where it can be released into the atmosphere.

 

Your body draws in oxygen from the atmosphere and generates carbon dioxide every minute of the day for your whole lifetime. As oxygen is consumed by the cells in your body it is replaced by a process called photosynthesis which occurs in trees, ferns and other plants. These trees, ferns and plants soak up carbon dioxide by using the energy from the sunlight and the water from the ground to make the food it needs to live. This process of photosynthesis produces waste which is called oxygen. This oxygen waste is what we breathe in each and evey day.

 

To move this oxygen around the body we use two systems referred to as the respiratory system and the circulatory system. The respiratory system draws the oxygen into the lungs and sends the waste carbon dioxide into the atmosphere where as the circulatory system delivers the fresh oxygen in the lungs to each cell in your body and also picks up the waste and carries in back.

For further information on the breathing process - please refer to the video attached

 

http://online.factsonfile.com/the-respiratory-system/chapters/chapter-6.aspx

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

How the Nose Helps with Breathing

 

When you breathe air in you are also breathing in dust, skin flakes, insect body parts, clothing fibres, pollen grains and bacteria and germs. The lungs can't handle all of these inpurities so the nose needs a really good filtering system.

 

Inside the nose there are membranes that are sticky with mucus. As the air is drawn in, large particles of inpurities are filtered out by tangles of hair. As the air then passes through the nose it encouters a number of curved projections which seperate any remaining particles onto the mucus. There are also tiny hairlike projections called Cilia which sway from side to side sweeping dirty mucus backwards through the nasal passage to the throat where it passes to the stomach for digestion.


 

 

 

 

 

 

 

 

 

 

 

 

 

Air Pathway

 

Air and food share a common pathway for part of the journey to the lungs. Cleaned air from the nasal cavity passes through the throat, larynx, and trachea to reach the lungs. Food from the mouth exits the throat through the esophagus on its way to the stomach. 

 

In order to expand and draw in air, lungs depend entirely on the diaphragm and intercostal muscles. When the diaphragm contracts it flattens and pulls the lungs downwards while contraction of the intercostal muscles causes the rib cage and the lungs to move upward and outward. As the space inside the lungs increases, air pressure inside them decreases to below that of the outside of the body. This pressure difference causes air from the outside to flow through the nose and down to the lungs bringing with it fresh supplies of oxygen.

 

Deep inside the chest is the trachea which divides to form the left and right bronchi that carry air into and out of the lungs. Each bronchi divides repeatedly to form a branching system of ever-smaller bronchi. These small bronchi divides again and again into tubes no wider than a hair called bronchioles. The bronchioles end with grapelike clusters called alveoli; which are tiny air filled sacs that make up most of the lungs. Alveolis are embedded in elastic connective tissue that allows the lungs to expand and recoil with ease during breathing. There are over 145 million microscopic alveoli in each lung, covered by a web of tiny capillaries through which an endless flow of blood dumps carbon dioxide and picks up oxygen.

 

 

Read 1445 times Last modified on Saturday, 03 October 2015 11:22

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