Q. The substance that is released at axonal endings to propagate a nervous impulse is called: an ion nerve glue a neurotransmitter the sodium-potassium pump an action potential Answer: a neurotransmitter

Q. The ability to respond to a stimulus is termed: polarized irritability depolarized conductivity all-or-none response Answer: irritability

Q. An action potential: is essential for nerve impulse propagation involves the influx of negative ions to depolarize the membrane involves the outflux of negative ions to depolarize the membrane involves the outflux of positive ions to depolarize the membrane is initiated by potassium ion movements Answer: is essential for nerve impulse propagation

Q. Impulse conduction is fastest in neurons that are: myelinated unmyelinated sensory motor cerebral Answer: myelinated

Q. Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid: sodium chloride calcium potassium magnesium Answer: potassium

Q. White matter refers to myelinated fibers in the? CNS PNS ANS SNS both ANS and SNS Answer: CNS

Q. Which of the following best describes the waxy-appearing material called myelin? an outermembrane on a neuroglial cell a lipid-protein (lipoprotein) cell membrane on the outside of axons a mass of white lipid material that surrounds the cell body of a neuron a mass of white lipid material that insulates the axon of a neuron

Q. A neuron with a cell body located in the CNS whose primary function is connecting other neurons is called a(n): efferent neuron afferent neuron interneuron glial cell satellite cell Answer: interneuron

Q. Collections of nerve cell bodies inside the PNS are called: ganglia tracts nerves nuclei tracts or ganglia Answer: ganglia

Q. The Schwann cells form a myelin sheath around the: dendrites cell body nucleus axon nodes of Ranvier Answer: axon