Capillaries are the smallest blood vessels in the body, and they are responsible for the exchange of oxygen and carbon dioxide between the blood and the tissues. They are lined by a single layer of endothelial cells, which are very thin and delicate.
Nerve endings are specialized structures that are responsible for detecting changes in the environment and sending signals to the brain. They are typically found in the skin, muscles, and organs.
Since capillaries do not have nerve endings, they are not able to sense pain or other sensations.