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Human Lungs | Parts of Respiratory system | Human anatomy | 3D animation videos


Humans for respiration need a continuous supply
of oxygen. Humans take in oxygen and leave out carbon
dioxide, which is the poisonous waste product in the process of respiration.
The lungs are essential respiratory organs in the human body.
The human anatomy consists of two lungs. They can be called as the left and the right lung,
respectively. The left lung has two lobes while the right
lung has three lobes. The lungs contain approximately 1500 miles
of airways and about 300 to 500 million alveoli. The total surface area is an approximate of
70m^2 (m-square) in a fully grown human body, (roughly the size of a badminton court).
An alveoli , also known as “little cavity”, is derived from the Latin word “alveolus”,
and these are the terminal ends of a respiratory tree and are shaped like a hollow-cavity.
The average respiratory rates of a resting adult is about 10-20 breaths per minute.
We spend about 1/3rd of a minute in inhaling. The total breathing capacity, however depends
on the individual, that is, it varies on factors depending on age, height, weight and sex.
It is observed that females tend to have a 20-25% lower breathing capacity than males,
while tall people tend to have a larger lung capacity than shorter people. And people living
in low-lined areas, that is, at the sea-level, tend to have a smaller lung capacity than
those people living at a higher altitude. People who smoke have a lower lung capacity
than non-smokers. Lungs function similar to that of bellows,
which is a mechanical device that blows strong current of air.
**Lungs convert the hormones that cause the narrowing of blood vessels and drives the
blood pressure up and also remove the waste products in the blood.**
A lung is measured to be between 10-12 inches long. The two lungs are separated by a structure
called “media sternum”. The lungs are covered by a structure known
as the “pulmonary pleura”. The lung is an important organ that performs
various functions that happen every second of our lives, out of which breathing is considered
to be the most essential. As previously mentioned, the lungs take in
oxygen and give out carbon dioxide. The air that we breathe in, enters the human
body and reaches to the lungs through a windpipe , called trachea, which branches further into
two main tubes which distributes the air supply to both the left and the right lung , respectively.
These tubes further divide themselves into 22 times the number of branches resulting
in the formation of more than 100,000 smaller tubes, called bronchioles, and about 300 million
air sacs( or alveoli), which are only about a 0.3 mm in diameter.
Since the walls of the alveoli are 1/50th the thickness of a tissue paper and are also
covered up with millions of tiny blood vessels, called capillaries, there is a free-flow exchange
of both, oxygen and carbon dioxide, between the body and the environment.
The lungs play an important role in the body’s defense against infection and other harmful
environmental factors. Air that is inhaled either through the nose
or the mouth may consist of various dust particles or infectious agents, and ended up getting
stored in the lungs. Mucus, which is a sticky liquid that is produced
by the lungs, may trap the inhaled particles while the lung’s white blood cells , that
serve as protective agents, aid in the engulfment and destruction of such harmful matter and
bacteria. Hence one good alternative is to cough. Coughing
helps clear the mucus and other materials from the lungs.

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