11. Nervous Tissue and Nervous System

A ________ is characterized by multiple input neurons synapsing on one postsynaptic neuron.

a. Diverging circuit

b. Discharge zone

c. Facilitation zone

d. Converging circuit

Mark the following statements as true or false. If a statement if false, correct it to make a true statement.

Postsynaptic potentials may summate by spatial summation in which multiple neurons fire onto a single postsynaptic neuron.

Mark the following statements as true or false. If a statement if false, correct it to make a true statement.

An inhibitory postsynaptic potential causes the membrane potential of the postsynaptic neuron to approach threshold.

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

The velocity of nerve impulse conduction is greatest in

a. Heavily myelinated, large-diameter fibers

b. Myelinated, small-diameter fibers

c. Nonmyelinated, small-diameter fibers

d. Nonmyelinated, large-diameter fibers

During a neurobiology lecture, a professor repeatedly refers to group A and group B fibers, absolute refractory period, and myelin sheath gaps. Define these terms.

What are the structural and functional differences among type A, B, and C fibers?

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?