Pick up oxygen and give up carbon dioxide
respiratory bronchioles
When we inhale in and out oxygen moves from the alveoli to blood carbon dioxide moves from blood to alveoli.
They are the alveoli.
alveoli
Alveoli is the plural of alveolus. This is the name of the microscopic air sacs in the lungs where inspired gas comes in contact with capillaries of the pulmonary circulation, allowing gas exchange between air and blood. Oxygen enters the blood and carbon dioxide leaves the blood inside the alveoli.
Alveoli
Alveoli alveoli - air sacs in your lungs
Blood capillaries surrounding air sacs called alveoli.
Simply put, the gas exchange occurs in the lungs. More specifically, the blood exchange occurs at the avoli, the "air sacs" in the lungs where the surrounding capillaries can be oxygenated.
bronchi ,alveoli, or veins
alveoli
Oxygen must enter our blood and Carbon Dioxide must leave the blood through our lungs. They do so by diffusion between the cappillaries.