The alveoli are completely covered in blood vessels (capillaries). The walls of the capillaries are extremely thin and the distance between air and blood is only 0.3μm.
This means that O2 has no distance to travel to get into the blood. The alveoli increase the surface area hugely. Humans have 300 million alveoli in both lungs giving a total surface area of 80 m2 (The skin is 2m2).
By the alveoli
Lungs
lungs
The alveoli
The respiratory system is composed of organs such as the lungs, trachea, bronchi, bronchioles, alveoli, and diaphragm. These organs work together to facilitate the exchange of oxygen and carbon dioxide in the body.
The five major organs of the respiratory system are the lungs, trachea, bronchi, diaphragm, and alveoli. These organs work together to help you breathe by intaking oxygen and releasing carbon dioxide.
The gall bladder and other organs filter the bad .
yes
Yes, the lungs.
you don't have to the brain and heart do all the work
No. Tissues work together to make organs. Organs work together to make the organ system
these are as follows: brochus,branches of bronchus called bronchii, alveoli