If it's relating to human physiology... the answer is alveoli. They are microscopic sac-like structures found in the lungs, which facilitate gas exchange.
It is to remove carbon dioxide and take in oxygen.
The small sac-like structures in the lungs are called alveoli. This is where the exchange of oxygen and carbon dioxide occurs with the bloodstream, a process known as gas exchange. Oxygen diffuses from the alveoli into the bloodstream, while carbon dioxide moves from the bloodstream into the alveoli to be exhaled.
Alveola sac
The small sac-like structures that are the site of gas exchange in the lungs are called alveoli. They are responsible for the exchange of oxygen and carbon dioxide between the air we breathe and our bloodstream, allowing for efficient respiration.
when i had my first miscarriage the fetal sac came out in the toilet and it looked like a little veiny blood sac. it was really small almost like a bubble.
In the alveoli (also called air sac) is the capillary-rich sac in the lungs where the exchange of oxygen and carbon dioxide takes place by diffusion. The oxygen poor blood goes from the right ventricle and into the lungs where the co2 is traded for Oxygen in the alveoli and back through the heart and out to the body.
sac
Oxygen passes into the capillaries that surround the alveoli. The thin walls of the capillaries make this diffusion easier.
Sac fungi get their name because of their asexual spore production, they produce their spores in pod/sac-like structures called asci.
Oxygen and carbon dioxide are exchanged at the surface of the air sac. Oxygen is taken in from the air into the bloodstream, while carbon dioxide is released from the bloodstream into the air to be exhaled.
These small sac like structure are known as the alveoli . The alveoli help in the exchange of the gases, oxygen & carbon-dioxide,Lungs contain alveoli to increase the surface area and to easily transport oxygen to the blood vessels which surrounds the air sacs. Also, the air sacs have a thin film of oxygen which helps to absorb oxygen quickly.
It is the scrotum.