Chapter 12

Question 1

Nervous systems are composed of what?

Answer 1

cells

Question 2

do neurons have contact and communicate w/ each other?

Answer 2

yes

Question 3

known as support cells of nervous system

Answer 3

glial cells

Question 4

resting membrane potential of neurons are ionic basis which is ?

Answer 4

selective permeability of ions

Question 5

AP are _____ cells and _____of cell membrane.

Answer 5

excitable, depolarization

Question 6

propagation of AP travels where?

Answer 6

down axon

Question 7

T/F: neurons have a huge variety of shapes.

Answer 7

true

Question 8

Glial cells can be half of mass of CNS in animals and outnumber neurons by how much?

Answer 8

10:1

Question 9

what are astrocytes?

Answer 9

nutrient support

Question 10

In glial cells, microglial cells functions what?

Answer 10

immune

Question 11

T/F: Oligodendrocytes (CNS) and Shwann cell(PNS) create and maintain myelin sheath around axon.

Answer 11

true

Question 12

Soma is the site of ?

Answer 12

intergration

Question 13

axons transmit signals long distance up to?

Answer 13

1 m

Question 14

what is the site of communication between neurons?

Answer 14

synapse

Question 15

glia produces and maintains?

Answer 15

myelin

Question 16

In resting membrane potential Vm is approx ___ mV, ____on inside compared to outside?

Answer 16

-65. negative

Question 17

___ mV is the standard Vm for neurons.

Answer 17

-65

Question 18

in RMP why is vm not zero?

Answer 18

because of selective permeability of membrane to ions of k+,Na+,Cl-

Question 19

bulk solution is electrically?

Answer 19

neutral

Question 20

T/F: Vm is due to gathering of ions near the membrane

Answer 20

true

Question 21

T/F: Nernest and goldman equation allows us to calculate vm from permeabilities and concentration of ions

Answer 21

true

Question 22

In RMP, membrane has _____ and _____

Answer 22

resistance and capacities

Question 23

T/F: In RMP, time constant and length are important properties.

Answer 23

True