In multiple sclerosis, there is intermittent and progressive damage to the myelin sheath of peripheral nerves. This results in poor motor control of the affected area. Why does destruction of the myelin sheath affect motor control?

Explain how an action potential is propagated down an axon in continuous conduction. Why is saltatory conduction faster than continuous conduction?

In unmyelinated axons, action potentials are propagated by_________ conduction.

Dr. Roberts is testing a new drug that blocks sodium channels in the axons of a neuron. Which of the following statements is correct?

Would you expect to find larger motor units in the postural muscles of the back or the muscles of the hand? Explain your answer.

Explain why cardiac muscle cells and some smooth muscle cells will continue to contract even when their nerve supply has been removed