Tiny, thin-walled vessels that bring nutrients to the cell are called:

The correct choice, capillaries, refers to the tiny, thin-walled blood vessels that play a crucial role in the circulatory system. These vessels are essential for the exchange of nutrients, oxygen, and waste products between the blood and the surrounding tissues. The walls of capillaries are only one cell thick, which facilitates this exchange process, allowing nutrients and oxygen to pass through easily while also enabling the removal of carbon dioxide and other waste products from the cells.

Capillaries connect the arterial and venous systems, functioning as the sites where blood flow transitions from larger vessels into the microcirculation that nourishes the body’s tissues. This is a fundamental concept in understanding how the body sustains itself at the cellular level. In contrast, arteries carry blood away from the heart, veins return blood to the heart, and venules are small veins that collect blood from capillaries, but none of these structures are specifically designed for the nutrient and gas exchange that occurs in capillaries.