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

Question

Quizplus · Accepted Answer

The sharp immediate pain was due to the stimulation of myelinated axons, which are responsible for transmitting signals quickly and rapidly from the site of injury to the spinal cord and brain. Once the injury has occurred, the myelin sheath is damaged, and the axons become hyperexcitable, leading to the sensation of pain. The later aching pain was due to the activation of unmyelinated axons, which are slower to transmit signals, but convey a more persistent, dull and nagging type of pain that persists even after the initial injury has healed.

Avi Broke His Ankle Skiing