September 2022

Q. Which of the following is the correct sequence in a typical reflex arc: effector, afferent neuron, integration centre, efferent neuron, receptor receptor, afferent neuron, integration centre, efferent neuron, effector effector, efferent neuron, integration centre, afferent neuron, receptor receptor, efferent neuron, integration centre, afferent neuron, effector receptor, afferent neuron, efferent neuron, integration centre, effector Answer: […]

Q. Which one of the following describes saltatory conduction: occurs only if the myelin sheath is continuous occurs only if the nodes of Ranvier are lacking occurs only in the absence of axon hillocks is faster than conduction on an unmyelinated fiber is slower than conduction on an unmyelinated fiber Answer: is faster than conduction

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