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.
Carbon dioxide
Carbon dioxide
Carbon dioxide.
Carbon dioxide
Grape-like clusters of respiratory structures are called alveoli, found at the end of bronchioles in the lungs. Each alveolus is surrounded by tiny blood vessels where gas exchange occurs, allowing for the intake of oxygen and removal of carbon dioxide from the body.
The respiratory system moves oxygen in and carbon dioxide (CO2) out.
The greatest stimulation on the respiratory center in the brain comes from an increase in carbon dioxide levels in the blood. This triggers the respiratory center to increase breathing rate to eliminate excess carbon dioxide and restore normal levels of oxygen in the blood.