Chapter 12 Flashcards
Nervous systems are composed of what?
cells
do neurons have contact and communicate w/ each other?
yes
known as support cells of nervous system
glial cells
resting membrane potential of neurons are ionic basis which is ?
selective permeability of ions
AP are _____ cells and _____of cell membrane.
excitable, depolarization
propagation of AP travels where?
down axon
T/F: neurons have a huge variety of shapes.
true
Glial cells can be half of mass of CNS in animals and outnumber neurons by how much?
10:1
what are astrocytes?
nutrient support
In glial cells, microglial cells functions what?
immune
T/F: Oligodendrocytes (CNS) and Shwann cell(PNS) create and maintain myelin sheath around axon.
true
Soma is the site of ?
intergration
axons transmit signals long distance up to?
1 m
what is the site of communication between neurons?
synapse
glia produces and maintains?
myelin
In resting membrane potential Vm is approx ___ mV, ____on inside compared to outside?
-65. negative
___ mV is the standard Vm for neurons.
-65
in RMP why is vm not zero?
because of selective permeability of membrane to ions of k+,Na+,Cl-
bulk solution is electrically?
neutral
T/F: Vm is due to gathering of ions near the membrane
true
T/F: Nernest and goldman equation allows us to calculate vm from permeabilities and concentration of ions
true
In RMP, membrane has _____ and _____
resistance and capacities
T/F: In RMP, time constant and length are important properties.
True
