Which of the following is NOT a component of the circulatory system?

The human circulatory system consists of a network of arteries, veins, and capillaries, with the heart pumping blood through it. Its primary role is to provide essential nutrients, minerals, and hormones to different parts of the body. 

Villi is a component of the gut that aids in the absorption of nutrients from food. The presence of villi increases the surface area for the absorption of nutrients.