Respiratory System

What’s come up on your mind when you hear the word respiratory system? Respiratory System is the integrated system of organs involved in the intake and exchange of oxygen and carbon dioxide between an organisms and the environment.

The main function of respiratory system is to supply blood with oxygen in order for the blood to deliver oxygen to all parts of our body. The respiratory system does this through breathing. When we breathe, we inhale oxygen and we exhale carbon dioxide. This exchange of gases in the respiratory system means we getting oxygen to the blood.

Respiration is achieved by our mouth, nose, trachea, lungs, and diaphragm. Then, the oxygen passes through the larynx (speech sounds are produced here) and the trachea (a tube that enters the chest cavity). In the chest cavity, the trachea divides into 2 smaller tubes. It is called the bronchi. Then, each bronchus divides again form the bronchial tubes. The bronchial tubes lead directly into the lungs where they divides into many smaller tubes which connect to the tiny sacs called alveoli. The average adult’s lungs contain about 600 millions of these spongy, air-filled sacs that are surrounded by capillaries. The inhaled oxygen passes into the alveoli. Then, diffuses through the capillaries into the arterial blood. The waste-rich blood from the veins releases its carbon dioxide into the alveoli. The carbon dioxide then out of the lungs when you exhale.

The diaphragm’s job is to help pumping the carbon dioxide out of the lungs and pull the oxygen to the lungs. Diaphragm is a sheet of muscles that lies across the bottom of the chest cavity. As the diaphragm contracts and relaxes, breathing takes place. When the diaphragm contracts, oxygen is pulled in the lungs. While when the diaphragm relaxes, carbon dioxide is pumped out of the lungs.

The diseases of the lungs are pneumonia, asthma, chronic bronchitis, and lung cancer. Pneumonia is an infection of the alveoli. It caused because of many kind of both bacteria and viruses. In asthma, periodic constriction of the bronchi and bronchioles makes it more difficult to breathe in, and specially breathe out. Attacks of asthma can be triggered by airborne irritants such as chemical fumes and cigarette smoke; airborne particles to which the patient is allergic. In chronic bronchitis, the air passage becomes clogged with mucus, and this lead to a persistent cough. Chronic bronchitis is usually associated with cigarette smoking. Lung cancer is the most common cancer and the most common causes of cancer in world. Lung cancer is uncontrolled proliferation of cells. There are several forms of lung cancer, but the most common types are those involving the epithelial cells lining the bronchi and bronchioles. Ordinarily, the lining of these airways consists of two layers of cells. Chronic exposure to irritants causes the numbers of layers to increase. This is especially apt to happen at forks where bronchioles branch.

For more information, click this link: http://www.youtube.com/watch?v=HiT621PrrO0

By : Alyssa Chrysilla 9C

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About encyclopediascience

This site is to post about the human health. It explains how the human health varies from Digestive System,Nervous System, Drug Abuse , etc. Enjoy!
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