What is breathing?
1 Answer
Breathing is an inhalation and exhalation process.
Explanation:
As we inhale the air, through nose or mouth ( mostly through nose), it goes through a lot of processes, like warming by blood capillaries , moisturizing by mucus membrane and removal of dust. . and from here on, it goes through pharanyx, larynx(Voice Box), trachea, bronchi, bronchi-oles and then alveolies. and yeah in lungs, the layers of cells lining the alveoli and the surrounding capillaries are each only one cell thick and are in very close contact with each other.
This barrier between air and blood averages about 1 micron (1/10,000 of a centimeter, or 0.000039 inch)* in thickness.
Oxygen passes quickly through this air-blood barrier into the blood in the capillaries. Similarly, carbon dioxide passes from the blood into the alveoli and is then exhaled.
For more concept,check out these videos..
Khan Acadmey
Crash Course
Hope this Helps..
