nervous tissue: structure and function (mastering A&P)

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What cells of the nervous system are responsible for anchoring neurons to their blood vessels and controlling the extracellular fluid concentrations of potassium and neurotransmitters?

astrocytes

What is the most abundant glial cell in the central nervous system (CNS)?

astrocytes

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

What part of a neuron receives signals and sends a message to the cell body?

dendrite

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

dendrites

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

motor

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

Which of these neuroglial cells forms the myelin sheath in the central nervous system?

oligodendrocytes

Bundles of nerve fibers (neuron processes) running through the CNS are called ________, whereas in the PNS they are called ________.

tracts; nerves

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

white; gray

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

Interneurons (association neurons)

Why is white matter "white"?

It contains a high concentration of myelin.

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

Schwann

Ganglia are collections of ________.

cell bodies

Unmyelinated nerve fibers are known as ________.

gray matter

The two major functional properties of neurons are ________.

irritability and conductivity

Which of these is a deep pressure receptor?

lamellar corpuscle

Sensory receptors located in muscles and tendons are termed ________.

proprioceptors


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