Chapter 8, Problem 40RA

Table 7.3 (chapter 7) provides the axon diameters and conduction velocities required to answer the following questions.

Suppose, in a knee-jerk reflex, the sensory axon and motor axon extending between the muscle and spinal cord are each 16 inches long. The sensory axon has a diameter of $\text{17 μm,}$ and the motor axon has a diameter of $\text{9 μm}$. Given that there are 2.54 cm per inch, and that a rate of

1 m/sec is equal to 2.24 miles per hour, answer the following questions.

Suppose the time from the start of action potentials in the sensory neuron and the end of action potentials in the motor neuron was measured to be 15 milliseconds. How much time was required for synaptic transmission?