Question

Why did the timescale have to be changed to measure the conduction velocity of the C fibers?

1) The total time shown on the oscilloscope would have been too long to see the action potential at R2
2) The total time shown on the oscilloscope would have been too short to see the action potential at R2
3) The conduction velocity was too fast to see the action potential on the oscilloscope
4) The length of the C fiber was different from the length of the A and B fibers

Answer 1

The timescale had to be changed to measure the conduction velocity of the C fibers because their action potential is slower and smaller compared to A and B fibers.

Step-by-step explanation:

The conduction velocity of C fibers is so slow that the total time shown on the oscilloscope would have been too long to see the action potential at R2. The action potential in C fibers is much smaller and slower compared to A and B fibers, which are larger and faster. This is due to the smaller diameter of C fibers and the continuous nature of their conduction. In order to accurately measure the conduction velocity of C fibers, a different timescale is needed to capture the slower action potential.