Unit 3 Flashcards
(201 cards)
What is the receiving area of a neuron
Dendrite
What is the entire middle section of the cell that contains a majority of the organelles
Cell body/soma
What is the center structure inside the cell where DNA is housed?
Nucleus
What is a myelin sheath
Formation of several bundles of white material that are wrapped around a thin gray structure. The bundles function as an insulation. It spreads up a action potential
What part of a neuron is a specialized area of a neuron that generates action potentials when appropriate stimulated
Axon
What is the enteric nervous system?
It act to autonomously or can be controlled by the CNS through the autonomic division of the PNS. Regulated digestive system.
Define sympathetic
The fight / flight mode
Define parasympathetic
Rest and digest
Define efferent neurons
Involuntary control
Where are the voltage gated channels on a neuron?
On the axon
Where are the receptor channels on a neuron?
On the dendrites
Define a axon hillock
It is a thin , long gray cellular extension inside white bundles. This part of a neuron conducts or transmits action potentials from the cell body to where a neurotransmitter or neuromuscular it’s are released
What is an axon collateral?
When a axon splits off into multiple terminals
Define a pseudounipolar neuron
It have a single proceeds called the axon during the development the dendrite fuse with an axon
Define a interneuron
Have bits and pieces that communicate between one part of the brain to another part. Internal CNS communication
Define a bipolar neuron
Have two relatively equal fibers extending off the central cell body
Define anaxonic neuron
Have interneurons with no apparent axon
Define a oligodendrocytes
A specific cells to form a myelin sheath in the CNS. They wrap a few separate neurons with their arm like extensions
Define microglia cells
Modified immune cells. They act as scavangers during brain development. To remove excess neurons
Define astrocytes. What do they do
•They take up k+, water and neurotransmitters
•The secrete neurotrophicfactors
•They help form blood brain barrier , therefore provide substrates for ATP
• A source of neural stem cells like ependymal cells
Define neurotrophic
Neurogrowth
What are ependymal cells?
They form a barrier between brain tissue and the ventricles.
What are the glial cells of the CNS
Ependymal cell
Astrocyte
Microglia
Oligodendrocytes
What are the PNS glial cells?
Satélite cell
Schwann cell (neurolemmocytes)