Question

exam 3 - chapters 10 and 11 nervous syst... saltatory conduction ______ multiple choice is slower than conduction on an unmyelinated fiber occurs only if nodes of ranvier are lacking is faster than conduction on an unmyelinated fiber occurs only if the myelin sheath is continuous

Explanation:

Saltatory conduction occurs in myelinated axons, where action potentials "jump" between nodes of Ranvier. Unmyelinated fibers conduct action potentials continuously along the entire length of the axon, which is slower. So saltatory conduction is faster than conduction on unmyelinated fibers. The other options are incorrect: saltatory conduction requires nodes of Ranvier (so "occurs only if nodes of Ranvier are lacking" is wrong), myelinated fibers have discontinuous myelin (so "occurs only if the myelin sheath is continuous" is wrong), and it is faster (not slower) than unmyelinated conduction.

Answer:

The option "is faster than conduction on an unmyelinated fiber" (assuming this is the second option from the left, let's denote it as Option B for clarity: B. is faster than conduction on an unmyelinated fiber)