Capillary (noun)

A very small blood vessel connecting arteries and veins, forming a network throughout the body.

Origin:

From the latin word 'capillaris' meaning 'of hair'.

Examples:

1. The capillaries played a crucial role in the exchange of oxygen and nutrients between the body and its cells.
2. The capillaries were so small that they could only be seen under a microscope.
3. The capillaries were easily damaged, leading to bruising and other internal bleeding.
4. The capillaries were an important part of the cardiovascular system, transporting blood and nutrients throughout the body.
5. The capillaries in the fingertips were important in regulating temperature, allowing blood flow to increase or decrease as needed.