These are tiny pockets in the lungs where oxygen and carbon dioxide are exchanged.
Oxygen enters the bloodstream through the alveoli in the lungs. When you breathe, oxygen from the air diffuses across the thin walls of the alveoli into the surrounding capillaries, where it binds to hemoglobin in red blood cells for transport throughout the body.
There are many capillaries in the lungs. These small blood vessels are the site of gas exchange in the alveoli.
Within the lungs.
Oxygen enters the blood in the alveoli of the lungs
The site for gaseous exchange is the lungs. Carbon dioxide is exhaled and is substituted for oxygen which is inhaled.
The alveoli
A salamander has both lungs and gills to breathe underwater. I found a good site if you want to read more about them.
Aveloli are the structures within the lungs, at the terminal end of bronchioles. They are not blood vessels. Aveoli resemble a cluster of grapes hanging off the smallest branches of a tree, with the tree upside down. The main bronchus in the upper chest is like the tree trunk, the bronchi branch and thin to bronchioles, then end at the aveoli. There O2 and CO2 exchange takes place.
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Capillaries are the blood vessels that surround the alveoli, or air sacs, in your lungs. These capillaries are the site of gas exchange.
The initial site for respiration is in the lungs, where oxygen is inhaled and carbon dioxide is exhaled. Oxygen enters the bloodstream through tiny air sacs called alveoli in the lungs, where it is then transported to cells throughout the body to support cellular respiration.
Lungs do not pump blood. They are the site of gas exchange between capillaries and alveoli.