Capillaries. Its one-celled thick structure help it to perform its work efficiently
capillaries and lacteals
In your mom!
Diffusion.
sperm
capillaries
veins
Assuming this refers to blood vessels, the answer is the capillaries.
Capillary: A tiny blood vessel where substances are exchanged between the blood and the body cells.
Capillaries are the smallest blood vessels. They connect arteries and veins. They are the site of gas, waste, and nutrient exchange between the blood and the body tissues.
Gas exchange occurs in the vessels of the lungs
the blood vessel which allows gas exchange to occur is the capillaries
The exchange of gases occurs at the ends of the airways in the lungs. Here tiny sacs called alveoli connect with tiny blood vessels and here exhaust gas [carbon dioxide] is exchanged for fresh gas [oxygen].
The umbilical cord contains the blood vessels that carry oxygenated and nutrient-rich food from the placenta to the fetus, and blood vessels that carry deoxygenated blood and nutrient-rich blood from the fetus to the placenta.
The umbilical cord contains the blood vessels that carry oxygenated and nutrient-rich food from the placenta to the fetus, and blood vessels that carry deoxygenated blood and nutrient-rich blood from the fetus to the placenta.
Capillaries are known as exchange vessels. Capillaries are the smallest of vessels and allow nutrients and waste to pass through blood and body.
Arteries to arterioles to capillaries where exchange occurs. Oxygen and nutrients are exchanged for carbon dioxide and wastes.