Avi Broke His Ankle Skiing

Multiple Choice

Avi broke his ankle skiing.At first, he felt a sharp and intense pain.The next day, the sharp pain was gone, but his ankle ached almost all the time.The sharp immediate pain was due to ; the later aching pain was due to .

A) unmyelinated axons; myelinated axons
B) myelinated axons; unmyelinated axons
C) pain receptors; pressure receptors
D) pressure receptors; pain receptors