The human lungs are designed to have maximum surface area for exchange of gases". Explain.
Answers
Given:-
The human lungs are designed to have maximum surface area for exchange of gases.
Required Answer:-
The exchange of gases takes place inside the Alveoli which is the structural and functional units of human respiratory system.
There are millions of alveoli present inside the lungs and comprises a total surface area of 80 m². They are covered with capillaries, hence they get maximum surface area for the exchange of gases otherwise 80 m² area won't fit inside our two small lungs.
more information:-
How Exchange of gases takes place inside alveoli?
Our Inhaled air has a high oxygen concentration than that is blood. So, Oxygen can easily diffuse from alveoli into the blood.
It binds with haemoglobin to form oxyhaemoglobin. This is then transferred to all the parts.
After the blood gets deoxygenated, Carbon dioxide is in higher concentration than that in alveoli. So, CO2 diffuses from the blood to alveoli. In this way, the gases are exchanged from outer to innner and vice-versa.
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Answer:
The human respiratory tract is made up of nostril, larynx, nasal chamber, pharynx, trachea, epiglottis, alveoli, bronchioles, bronchi and lungs. Within the lungs, the oxygen is exchanged for carbon dioxide waste through millions of microscopic sacs known as alveoli. The oxygen inhaled diffuses into the capillaries of the lungs, binds to the haemoglobin and is pumped into the bloodstream. The carbon dioxide from the blood diffuses through the alveoli and is expelled by exhalation.
The alveoli are thin-walled and richly supplied with a network of blood vessels to facilitate the exchange of gases between blood and the air-filled in alveoli. They have a balloon-like structure that provides maximum surface area for exchange of gases.