Nervous System Quiz

During an action potential, repolarization occurs as a result of A) potassium ions diffusing to the outside of the cell membrane. B) potassium ions diffusing to the inside of the cell membrane. C) sodium ions diffusing to the outside of the cell membrane. D) sodium ions diffusing to the inside of the cell membrane. E) sodium and potassium ions not diffusing.

A) potassium ions diffusing to the outside of the cell membrane.

Masses of myelinated nerve fibers appear A) white. B) gray. C) brown. D) transparent. E) red.

A) white.

Which of the following are adrenergic fibers? A) Parasympathetic postganglionic fibers B) Sympathetic postganglionic fibers C) Parasympathetic preganglionic fibers D) Sympathetic preganglionic fibers E) Motor fibers to skeletal muscle

B) Sympathetic postganglionic fibers

In the case of a subdural hematoma (blood accumulating beneath the dura) resulting from a blow to the head, blood accumulates between the A) dura mater and the bone of the skull. B) dura mater and arachnoid mater. C) pia mater and brain. D) arachnoid mater and pia mater. E) in the subarachnoid space.

B) dura mater and arachnoid mater.

The cardiac and vasomotor center are located in the A) pons. B) medulla oblongata. C) cerebellum. D) frontal lobe. E) thalamus.

B) medulla oblongata.

In the central nervous system myelin is formed by A) Schwann cells. B) oligodendrocytes. C) astrocytes. D) microglial cells. E) ependymal cells.

B) oligodendrocytes.

Amphetamines have stimulating effects on the nervous system because they A) block the action of norepinephrine. B) release norepinephrine. C) block the normal uptake of norepinephrine. D) increase the reuptake of norepinephrine from the synapse. E) break down norepinephrine.

B) release norepinephrine.

The complex network of tiny islands of gray matter in the brain that "awakens" the cerebral cortex is the A) dentate nucleus. B) reticular formation. C) limbic system. D) corpora quadrigemina. E) cerebellum.

B) reticular formation.

Which of the following is NOT a type of neuroglia? A) Astrocyte B) Oligodendrocyte C) Ependymal cell D) Neuron E) Microglial cell

D) Neuron

Which of the following lists parts of a reflex arc in the correct sequence? A) Receptor, motor neuron, sensory neuron, effector B) Effector, receptor, sensory neuron, motor neuron C) Effector, sensory neuron, receptor, motor neuron D) Receptor, sensory neuron, motor neuron, effector E) Receptor, effector, sensory neuron, motor neuron

D) Receptor, sensory neuron, motor neuron, effector

Which describes the ion concentrations inside and outside of a neuron? A) Sodium and potassium ions are both at higher concentration on the inside of the cell. B) Sodium and potassium ions are both at higher concentration on the outside of the cell. C) The sodium ion concentration is higher on the inside of the cell and potassium ion concentration is higher on the outside of the cell. D) The sodium ion concentration is higher on the outside of the cell and potassium ion concentration is higher on the inside of the cell. E) The concentrations of sodium and potassium ions are both equal inside and outside of the cell.

D) The sodium ion concentration is higher on the outside of the cell and potassium ion concentration is higher on the inside of the cell.

The cellular processes of neurons that provide receptive surfaces for input from other neurons are A) neurofibrils. B) Nissl fibers. C) axons. D) dendrites. E) nuclei.

D) dendrites.

The respiratory areas are in the pons and in the A) thalamus. B) cerebrum. C) midbrain. D) medulla oblongata. E) cerebellum.

D) medulla oblongata.

During an action potential, depolarization occurs as a result of A) potassium ions diffusing to the outside of the cell membrane. B) potassium ions diffusing to the inside of the cell membrane. C) sodium ions diffusing to the outside of the cell membrane. D) sodium ions diffusing to the inside of the cell membrane. E) sodium and potassium ions not diffusing.

D) sodium ions diffusing to the inside of the cell membrane.

Within the meninges, cerebrospinal fluid occupies the A) pia mater. B) dura mater. C) epidural space. D) subarachnoid space. E) none of the above.

D) subarachnoid space.

Which is true of drugs that decrease membrane permeability to sodium ions? A) Some are used as local. B) They may block nerve impulses from moving along the axon. C) They may prevent the perception of pain. D) They work by blocking sodium channels in the cell membrane. E) All of these are true.

E) All of these are true.

Sheaths of myelin produced by ____________ cells often enclose the axons outside of the brain and spinal cord.

Schwann

A nerve impulse consists of a wave of __________ potentials moving along the axon of a neuron.

action

The outermost layer of the meninges is the __________ mater.

dura

The __________ root of a spinal nerve consists of motor neuron axons.

ventral

The interconnected fluid-filled cavities in the brain are called ______________.

ventricles