ch.11 Flashcards
surround neuron cell bodies in peripheral nervous system
astrocytes
surround neuron axons in CNS
oligodendrocytes
contain cilia that move crebral spinal fluid
ependymal cells
beome macrophages that destroy microorganisms
microglia
surround neuron axons in peripheral nervous system
Schwann cells
If a potassium channel opens K+ will flow
out
If a sodium channel opens Na+ will flow
in
If a chloride channel opens, Cl will flow
in
If a calcium channel opens, the membrane will
depolarize
If the membrane becomes less positive/more negative than “at rest”
hyperpolarize
Which part of a neuron “determines” whether an Action Potential will be sent down the axon?
axon hillock
Which of these does NOT impact the speed of an action potential?
neuron location
Several EPSPs arrive at a neuron at the same time from different sites. This is:
special summation
The resting membrane potential of a neuron is:
-70mv
The threshold potential of a neuron is:
-55mv
A myelnated region of the nervous system is known as:
white matter
Wherever there is a gap/node in a myelinated axon, there is a high concentration of:
sodium channels
When a neuron receives input, the effect may decrease as it moves. This is:
graded potential
A neuron that carries information to the CNS is a :
sensory neuron
Which is the most common type of neurons?
mulitpolar
What is the status of channels during the “4” phase of the action potential?
sodium closed/potassium open
what is the status of channels during “I” phase of the action potential?
both closed
What is the status of channels during the “2” phase of hte action potential?
sodium open/ potassium closed
What is the status of channels during the “3” phase of the action potential?
sodium closed/potassium open
The absolute refractory period occurs when:
sodium channels cannot open
The relative refractory period is:
when sodium channels can open
which is true?
none is correct
Saltatory conduction is where:
myelin is present
Which is the cause of synaptic delay?
release and diffusion of neurotransmitter
Which is NOT a biogenic amine?
serotonin
