Alveoli.
Alveoli (plural) and alveolus (singular)
They are called Alveoli. They act as the primary gas exchange. Their wall is thin, and is surrounded by capillaries. This allows exchange of oxygen and carbon dioxide between the respiratory and circulatory systems.
carbon dioxide
The respiratory system utilises oxygen from the environmrntal gases and expires carbon dioxide (CO2).
Carbon dioxide.
blood carbon dioxide levels
Carbon dioxide
Carbon dioxide.
Carbon dioxide
Carbon dioxide
The respiratory system moves oxygen in and carbon dioxide (CO2) out.
During the respiratory system, oxygen travels through the respiratory tract and diffuses to the red blood cells from alveoli which receives carbon dioxide from the RBC's. The carbon dioxide comes from cells in the body. When the RBC's travel through the body to transfer oxygen to the cells it receives carbon dioxide. The carbon dioxide enters the alveoli and travels through the respiratory tract and is breathed out.