11. Nervous Tissue and Nervous System

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

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

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

a. Diverging circuit

b. Discharge zone

c. Facilitation zone

d. Converging circuit

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

Which of the following statements best describes saltatory conduction?

a. Every section of the axolemma must be depolarized and triggered to generate an action potential.

b. The internodes must generate action potentials.

c. The dendrites and cell bodies propagate EPSPs toward the trigger zone.

d. Only the nodes of Ranvier must generate action potentials.

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.

The trigger for exocytosis of synaptic vesicles from the presynaptic neuron is:

a. Arrival of an action potential at the axon terminal and influx of calcium ions.

b. Summation of IPSPs at the presynaptic neuron.

c. Binding of neurotransmitters to the axon hillock.

d. Influx of Na⁺ into the postsynaptic neuron.