Large arteries and veins are like high-capacity highways, and they branch into smaller capillaries which go all through the body, so capillaries are like roads.
The circulatory system transports all the things the body needs to survive through out the entire body. It also picks up the "trash" the body wants to get rid of and takes it to the liver and kidneys to be excreated. If you look at an anatomy picture of all the blood vessels in the body, it will resemble a huge road map.
Large arteries and veins are like high-capacity highways, and they branch into smaller capillaries which go all through the body, so capillaries are like roads.
National highway system
national highway system
An antonym for road is highway.
The Pan-American Highway. it stretches from northern Mexico to southern Chile.
allowable longitudinal slopes for highway road construction
The distance from the Interstate Highway at the Kentucky border and Interstate Highway 75 a the Michigan border is 211.5 miles. Like most of the Interstate Highway System, the exact distance is subject to change as it evolves and road construction continues to improve both traffic flow and road safety.
Slay Road Highway
A short road giving acess to a highway
The name of the national road varies by country. In the United States, it is called the National Highway System.