Assuming this refers to blood vessels, the answer is the capillaries.
Most nutrient absorption in the human body takes place in the small intestine.
Oxygen exchange takes place in the capillaries, which are the smallest blood vessels in the body.
Chemical reactions in the body take place in the nutrient known as ATP (adenosine triphosphate). ATP serves as the primary energy currency of the cell and is involved in various metabolic processes that require energy.
The actual air exchange in the lungs takes place in the alveoli, which are tiny sacs at the end of the bronchioles. Oxygen from the inhaled air passes through the walls of the alveoli and into the bloodstream, while carbon dioxide moves from the blood into the alveoli to be exhaled.
The exchange of oxygen and carbon dioxide takes place in the alveoli of the lungs. Oxygen from inhaled air diffuses into the bloodstream, while carbon dioxide from the blood diffuses into the alveoli to be exhaled. This exchange is facilitated by the thin walls and numerous capillaries surrounding the alveoli.
Capillaries
Pure diffusion ... everything flows from high concentration toward low. No energy is expended in these exchanges.
The exchange of oxygen takes place in the alveoli. It is found in our lungs
Chemical reactions in the body take place in water.
Chemical reactions in the body take place in water.
Most nutrient absorption in the human body takes place in the small intestine.
no
Mainly in the small intestine, but nutrient absorption also occurs in the rumen and omasum.
Their are many nutrient in our body that we need. But we mostly need water.
stomata
stock exchange
Oxygen exchange takes place in the capillaries, which are the smallest blood vessels in the body.