Write a paragraph about human respiratory system
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Parts of the respiratory system
As we breathe, oxygen enters the nose or mouth and passes the sinuses, which are hollow spaces in the skull that help regulate the temperature and humidity of the air we breathe.From the sinus, air passes through the trachea, also called the windpipe, and into the bronchial tubes, which are the two tubes that carry air into each lung (each one is called a bronchus). The bronchial tubes are lined with tiny hairs called cilia that move back and forth, carrying mucus up and out. Mucus is a sticky fluid that collects dust, germs and other matter that has invaded the lungs and is what we expel when we sneeze and cough. The bronchial tubes split up again to carry air into the lobes of each lung. The right lung has three lobes while the left lung has only two, to accommodate room for the heart, according to the American Lung Association. The lobes are filled with small, spongy sacs called alveoli, which is where the exchange of oxygen and carbon dioxide occurs. From the trachea, air enters the bronchial tubes which split up and reach into the three lobes of the right lung and the two lobes of the left lung.
The alveolar walls are extremely thin (about 0.2 micrometers) and are composed of a single layer of tissues called epithelial cells and tiny blood vessels called pulmonary capillaries. Blood in the capillaries picks up oxygen and drops off carbon dioxide. The oxygenated blood then makes its way to the pulmonary vein. This vein carries oxygen-rich blood to the left side of the heart, where it is pumped to all parts of the body. The carbon dioxide the blood left behind moves into the alveoli and gets expelled in our exhaled breath. The diaphragm, a dome-shaped muscle at the bottom of the lungs, controls breathing and separates the chest cavity from the abdominal cavity. When air gets taken in, the diaphragm tightens and moves downward, making more space for the lungs to fill with air and expand. During exhalation, the diaphragm expands and compresses the lungs, forcing air ou
Answer:
1.human respiratory respiration is carried out by lungs.
2.lungs are covered by ribs.
3.lungs consists of alveoli ...
4.diaphragm help for rythimic contraction and relaxation.
5.per min a normal breathing rate of a human is 16 - 20 times .