Nervous System Test

Cells that connect blood vessels to neurons are named

astrocytes

________ reflexes include the secretion of saliva, changes in the size of our pupils, and digestion involve the activities of smooth muscles.

autonomic

The Schwann cell forms a myelin sheath around the ________.

axon

The part of the neuron that typically conducts nerve impulses away from the cell body is the ________.

axon

The term central nervous system refers to the ________.

brain and spinal cord

The nervous system is structurally subdivided into two systems: ________ nervous system and ________ nervous system.

central; peripheral

The major role of the interneuron (association neuron) is to ________.

connect motor and sensory neurons in their pathways

The neuron processes that normally receive incoming stimuli are called ________.

dendrites

Cells that line the central cavity of the brain & spinal corded are named

ependymal cells

The two major functional properties of neurons are ________.

irritability and conductivity

Nerve cells that digest debris are called

microglial cells

The cell bodies of the ________ neurons are always located within the CNS

motor

Neurons with several processes branching off the cell body, such as motor neurons and interneurons (association neurons), are structurally classified as ________.

multipolar

Multiple sclerosis causes

myelin sheaths to be destroyed

Support cells in the central nervous system are collectively called ________.

neuroglia

The gaps between Schwann cells found at regular intervals in peripheral system neurons are called ________.

nodes of Ranvier

Nerve cells that make the myelin sheath are named

oligodendrocytes

Immediately after an action potential is propagated, which one of the following ions rapidly diffuses out of the cell into the tissue fluid ________.

potassium

________ cells form the myelin sheaths around nerve fibers in the PNS

schwann

During repolarization, ________ ions are pumped out of the cell.

sodium

The skeletal muscles are controlled by the ____ nervous system.

somatic

The gap between two communicating neurons is termed ________.

synaptic cleft

Nerve fibers that transmit impulses from the the visceral organs are known as

visceral fibers

Myelinated fibers (tracts) form ________ matter while unmyelinated fibers form ________ matter.

white, gray

There are ________ pairs of cranial nerves and ________ pairs of spinal nerves in the peripheral nervous system.

12,31

Which type of reflex arc does not contain an interneuron and is the faster of the two

2 neuron arc

________ connect sensory and motor neurons in neural pathways and their cell bodies are typically located in the central nervous system

Interneurons (association neurons)