What term refers to the end of the arteries where they become microscopic?

The term that refers to the end of the arteries where they become microscopic is capillaries. Capillaries are the smallest blood vessels in the body and are crucial for the exchange of oxygen, carbon dioxide, nutrients, and waste products between the blood and surrounding tissues. They serve as a bridge between the arterial and venous systems, allowing for this vital exchange to occur at a cellular level.

As arteries branch out and progressively narrow, they eventually lead to these tiny capillaries, highlighting the transition from the larger, more muscular arterial structure to the delicate networks that facilitate nutrient and gas exchange. This function is fundamental to sustaining cellular metabolism and overall bodily functions.