Functions
The function of the nervous system is to?
Control system for every bodily function
what is the basic cell of the nervous system?
Neruons
what acts as an insulator and speeds up the conduction of signals along the axon
Myelin sheath
what is the motto of action potentials, they are said to be ______.
(same strength/duration)
All or nothing
what is the junction allowing communication between cells?
the synapse
The Central nervous system contains what structures?
The Peripheral nervous system contains what structures?
Brain/spinal cord
Cranial/spinal nerves
what are 4 structural components to a neuron?
-cell body
-dendrites
-axon hillock
-axon terminal
what are the gaps along the myelin sheath that allow for the AP to jump to instead of having to wait for channels to open.
Nodes of ranvier
what is the resting membrane potentials voltage?
-70mV
what is the neruon called where the NT leaves the first neuron at the terminal and reaches the second neuron at the dendrites
(think before and after)
Postsynaptic neuron
Motor/efferent division carries where?
To the CNS
To various organs/muscles
what are the 2 supporting cells in the PNS
Hint: both start with an S
Schwann Cells
what is the voltage difference on either side of the membrane?
Membrane Potential
what causes the rapid depolarization of and creation of AP?
(think about your ions)
the opening of sodium channels and sodium ions entering
what stimulates the release of neurotransmitter?
voltage-gated calcium channels
Of the motor division, is the somatic nervous system voluntary/involuntary and vice versa for the autonomic nervous system?
SMS=voluntary
ANS=Involuntary
What cell forms the myelin sheath in the CNS
Oligodendrocytes
Where is the concentration of Na ions higher on the membrane and where is the concentration of K ions higher?
(Inside/outside membrane)
Na is outside, K is inside
what closes and what opens during repolarization?
Na channels close and K channels open letting K+ ions out
NT stimulates the opening of what?
(think about what NT is)
Chemical-gated channels
What is involuntary and lines the GI tract?
Enteric nervous system
what are the clusters of neurons in the PNS referred to as?
Ganglia
what causes the return of ions to where they came from so the gradiant is maintained and other Action potentials can occur?
(requires energy)
sodium/potassium pumps
What restores the RMP and requires energy?
Na/K pumps
what generates a new AP, due to depolarization
an excitatory neuron