Which of the following contains nerves and blood vessels and runs through the compact bone?
a)osteocytes
b)haversian canals
c)bone marrow
d)periosteum

B. harversian canals. 

these canals are found in the compact bone system. these are central canals located in the middle of the bone system. the channels are formed by concentric layers called lamellae. they consist of blood capillaries and nerves and assist bone cells in communication. 

The higher you go up the less oxygen there is