Respiratory Sub-Category

The Respiratory system is the system of respiratory passages, lungs and
respiratory muscles of human body. Respiratory system is responsible
for exchange of gases between the human body and the surroundings.
In the process of exchange of gases, human body gains oxygen and gets
rid of carbon dioxide. Other gases of the atmosphere have no significant
role in human respiratory system. Respiratory system is extremely important
for human body because the process of respiration cannot be stropped even
for a few seconds. If the process of respiration stops even for a minute
or two, the condition will become serious and will ultimately end in death.

Organs of human respiratory system:

The main organs of human respiratory system are lungs and respiratory passages.
Muscles of respiration also form a component of respiratory system but there
importance is rather little as compared to lungs and respiratory passages.

Lungs:

Lungs are the organs of human body where gaseous exchange take place. Human
beings have two lungs known as the right and left lungs. Lungs are soft, spongy
and very elastic.

Respiratory Passages:

Respiratory passages or air-ways are the conducting portions of human respiratory
system. Here no exchange of gases take place, but they guide the air to go to the
lungs and not anywhere else in the body. Conducting portion of the human respiratory
system consists of; Traches, Bronchi, Bronchioles, Alveolar sacs and Alveoli.