Why is our blood system is described as transport highway?

It is called The Transport Highway of the body because its like an highway sending all the nutrients in all parts of our body.

Beowulf and Grendel are antipodes - completely opposite characters. Neither of them is immortal, so they can fight each other. While Beowulf is a fearless warrior who came to save King Hrothgar's realm from menace, Grendel is a monstrous, bloodthirsty villain who enjoys killing and eating people. Grendel comes, "bearing God's wrath" because he is a descendant of Biblical Cain, who killed his brother. Even though he has a human shape, he is irrational like a monster:

"The monster had no thoughts of delay,
But swiftly seized the chance given,
Grabbed a sleeper, and tore him apart,
Bit to the bone, drank the heart’s blood,
Swallowing swathes; soon he’d eaten
That dead man, consumed him utterly,
Head to foot."

But Beowulf has another defining quality of a hero - enormous physical strength, so he rips Grendel's arm off, which will cause the latter's death.