Nervous System Organization Neurons Neuroglia

Electrical impulses gather and accumulate in which part of a neuron, in order to initiate an action potential?

• Dendrites

• Axon hillock

• Axon terminal branches

• Node of Ranvier

The Myelin sheath is derived from the

•  Microglia

•  Astrocytes

•  Schwann cells

• Oligodendrocytes

About glial cells, which is INCORRECT:

• Satellite cells have the same function as astrocytes.

• Schwann cells encapsulate multiple segments, while oligodendrocytes encapsulate only one segment. 

• Microglial cells support neurons and phagocytize bacterial cells and other debris.

• Astrocytes contribute to the blood-brain barrier.

Which of the following statements is false?

• The soma is the cell body of a nerve cell.

• Myelin sheath provides an insulating layer to the dendrites

• Axons carry the signal from the soma to the target.

• Dendrites carry the signal to the soma.

Motor neurons and interneurons are _______ neurons.

• pseudo-unipolar

• bipolar

• multipolar

• afferent

Clusters of neuron cell bodies within the peripheral nervous system are

• ganglia

• fascicles

• nuclei

• laminae

Cells found in the choroid plexuses that secrete cerebrospinal fluid are

• astrocytes

• microglia

• ependymal cells

• oligodendrocytes

• Schwann cells

Action potentials are conducted more rapidly

• in small-diameter axons than in large-diameter axons

• in unmyelinated axons than in myelinated axons

• along axons that have nodes of Ranvier

• All of these are correct.

Most of the neurons of our body are

• Unipolar

• Bipolar

• Pseudounipolar

• Multipolar

 Which type of cell would be present in large numbers if there were a bacterial infection in the brain?

• astrocyte

• oligodendrocytes

• microglia cells

• ependymal cells