describe the human respiratory system with diagram
Answers
The primary organs of the respiratory system are the lungs, which function to take in oxygen and expel carbon dioxide as we breathe.
The gas exchange process is performed by the lungs and respiratory system. Air, a mix of oxygen and other gases, is inhaled.
In the throat, the trachea, or windpipe, filters the air. The trachea branches into two bronchi, tubes that lead to the lungs.
Once in the lungs, oxygen is moved into the bloodstream. Blood carries the oxygen through the body to where it is needed.
Red blood cells collect carbon dioxide from the body’s cells and transports it back to the lungs.
An exchange of oxygen and carbon dioxide takes place in the alveoli, small structures within the lungs.
The carbon dioxide, a waste gas, is exhaled and the cycle begins again with the next breath.
The diaphragm is a dome-shaped muscle below the lungs that controls breathing.
The diaphragm flattens out and pulls forward, drawing air into the lungs for inhalation.
During exhalation the diaphragm expands to force air out of the lungs.
Adults normally take 12 to 20 breaths per minute. Strenuous exercise drives the breath rate up to an average of 45 breaths per minute.
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The air , passes through the nostrils.
The air that is passing is filtered by the fine hairs , which lines the passage.
Also , mucus helps in lining the passage , in the process involved.
From here , air passes through the throat and then into the lungs
In the throat , rings of cartilage are present , which ensures that the air passage does not collapse.
In the lungs , the passage is divided into very smaller tubes , that terminate into balloon like structures known as alveoli.
Alveoli is a surface that helps in the exchange of gases.
Extensive network of blood vessels is present in the walls of alveoli
When we breathe in , our ribs are lifted and diaphragm is flattened.
As a result , chest cavity becomes larger in size.
Therefore ,the air is sucked into the lungs , expanding the alveoli
Carbon dioxide are released into the alveoli by blood.
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Oxygen in the alveolar air is taken by alveolar blood vessels , and is transported to all the cells in the body.
