Lecture Quiz #5 (Pt.1)

Axons branch into axon terminals, which have ________ located at the terminal ends. A. bulbs B. dendrites C. nodes of Ranvier D. hillocks E. Schwann cells

A. bulbs

During a brain surgery, a surgeon passes an instrument through the dura mater. Which one of the following does the surgeon pass through next? A. cerebrospinal fluid B. arachnoid C. pia mater D. bones of the skull E. vertebrae

B. arachnoid

Cells that provide direct protection and physical support to neurons are... A. found primarily in lymphatic fluids. B. located only in the spinal fluid. C. nodes of Ranvier. D. neuroglial cells. E. myelinated.

D. neuroglial cells.

Which one of the following divisions of the nervous system predominates during the relaxed state? A. somatic division B. sensory division C. endocrine division D. parasympathetic division E. sympathetic division

D. parasympathetic division

Which one of the following processes is depicted in the figure above? A. repolarization of a neuron B. inhibition of a presynaptic neuron C. antagonistic effects of the parasympathetic and sympathetic nervous systems D. synaptic transmission E. hyperpolarization of an axon bulb

D. synaptic transmission

From an evolutionary standpoint, which of the following structures is considered the oldest, most primitive division of the brain? A. midbrain B. hindbrain C. corpus callosum D. forebrain E. cerebrum

B. hindbrain

The central nervous system is composed of which of the following? A. sensory division and motor division B. somatic division and autonomic division C. brain and spinal cord D. somatic division and motor division E. autonomic nervous system and brain

C. brain and spinal cord

Which component of the nervous system is divided into the somatic and autonomic divisions? A. peripheral B. sensory C. motor D. parasympathetic E. central

C. motor

A neuron at rest has a charge difference across its cell membrane, with the interior of the cell negative relative to the exterior. This difference in charge across the plasma membrane is referred to as ________ potential. A. refractory B. graded C. resting D. action E. depolarization

C. resting

Which one of the following is NOT directly involved in the production of a typical spinal reflex? A. interneuron B. stimulus C. sensory neuron D. brain E. motor neuron

D. brain

Which one of the following steps occurs during the absolute refractory period? A. Sodium channels open, releasing sodium ions into the neuron, which causes potassium channels to close. B. A nerve impulse fails to reach threshold. C. Sodium channels open, which causes potassium channels to open. D. Potassium channels open, releasing potassium ions from the neuron; sodium channels close. E. The neuron cannot generate an action potential.

E. The neuron cannot generate an action potential.

Which one of the following establishes and maintains the resting potential? A. Na+ leak channel B. K+ leak channel C. repolarization D. depolarization E. sodium-potassium pump

E. sodium-potassium pump

Excitatory neurotransmitters encourage the generation of new electrical impulses by which one of the following? A. stimulating depolarization of postsynaptic neurons B. stimulating saltatory conduction C. inhibiting postsynaptic neurons from repolarizing D. inhibiting presynaptic neurons from depolarizing E. stimulating depolarization of presynaptic neurons

A. stimulating depolarization of postsynaptic neurons