Test 1.1 Flashcards
What is the function of the choroid plexus
To maintain chemical environment of the CNS
What are the THREE layers of connective tissue called
Meninges
What is the layer between the skull and brain which is the most durable
Dura mater
What does myelin do
It speeds up neurotransmitter through insulation also reduces capacity
True or false
The speed of neurotransmitter is extremely important for getting quick info for communication
True
True or false
Myelin is not important
False
Myelin is extremely important without it your brain will not work
Which cell takes the most info and sends it to one place and where is it located
Cerebellar Purkinje cell and located inside the cerebellum
True or false
Glial cells transmit info
False they do not transmit info but they ARE important
What do astrocytes do
Process neurotransmitter into dopemine and maintain chemical environment
What forms myelin sheaths and adds structure stability
Oligodendrocytes
What does a Schwann cell do?
Form myelin in the PNS
Are all neurons myelinated?
No
Is the CNS a chemical organ or electrical
Electrical
Where does the analog part of the CNS take place?
In the dendrites and soma
What does a neuron do?
Stores potential energy and sends signals
Is the nervous system info transmitted slowly or fast and how is it transmitted
Slowly by moving big ions
What is a current
It is a change in electrical signal and if it moves over space it looks like movement
What is movement of ions called
A Current
Everything before the dendrites is________ &_________.
Everything after the axon hillock and to and from the axon is _________ &________
1) receptive and passive
2) active and transmission
What are microglia
They are macrophages which are big debris eaters
Where does the digital part of the nervous system take place
In the axon (aka action potential) which a all or none response
What happens if you get an action potential
You will receive a change in voltage
What is an action potential
A flow of ions
What does myelin allow for in the axon
It allows for sodium to be pushed down the axon
What is saltatory conduction
Jumping conduction which comes from sodium ions being pushed by the opening of channels inbetween the myelin
what are the Nodes of Ranvier
Opening of channels on the axon
explain what a Gap Junction is
It is two ions channels that allows the flows of current to happen between cells which is rare
Is a Gap junction a electrical synapse or chemical synapse
Electrical synapse
What is a chemical synapse responsible for
For intergration of neuronal info and communication from one neuron to the next
What does an action potential allow for
Allows for an opening up of a channel to allow concentration gradients to happen
What does a synaptic release require
Calcium
Explain what defines a neurotransmitter
1) must be present in pre-synaptic neuron
2) must be released in response to depolarization/ action potential
3) release must be dependent of Ca+
4) has to activate a membrane on post-synaptic cell
Which layer in the skull has spider web-like fibers that connect it to Pia mater
Arachnoid mater
What is the thin layer over the brain
Pia mater
What are sinuses in the brain
They are big veins that empty blood from the brain
What does retinal bipolar cell do?
Takes info from a straight line from one place to another and is a very simple cell
What is it called when the brain transmits info from neuron to neuron
Circuit
What is CSF
It is filtered blood which is filtered through the capillary system in each ventricular called Choroid Plexus
