Capillaries . The smallest of the blood vessels: capillaries.
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body.
lungs
The tiny sacs insure that the maximum area of tissue can be in close contact with the blood vessels to facilitate gas transfer
The tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged are called alveoli. They are surrounded by blood vessels through which gas exchange takes place during the process of respiration.
There are three types of blood vessels; arteries, veins, and capillaries. Capillaries are tiny blood vessels.
Why are nephrons surrounded by many tiny blood vessels
alveoli
Alveoli are tiny sacs in the lungs where the exchange of oxygen and carbon dioxide occurs during the process of respiration. They are surrounded by a network of blood vessels, allowing for efficient gas exchange to support bodily functions.
These tiny air sacs are called alveoli. These alveoli are surrounded by capilaries tiny blood vessells. These capilaries have holes that are to small for blood cells to escape but are big enogh for oxygen molecules to pass in to the blood stream and attach to the haemoglobin in your blood.
Capillaries
capillary
Tiny tubes in the respiratory system, such as bronchioles and alveolar ducts, are connected to the air sacs, or alveoli. These tubes help in the exchange of gases like oxygen and carbon dioxide between the lungs and blood vessels. The air sacs in the lungs facilitate this gas exchange process by increasing the surface area available for diffusion.